It took two months for Adam Gase to completely lose the faith of his fanbase.

That was the overwhelming consensus Sunday morning, when NJ Advance Media polled Jets fans ahead of Gase’s return to Miami.

After Sunday’s debilitating 26-18 loss to the lifeless Dolphins? Forget it.

This latest disaster – unquestionably the worst one yet – made the optimism of Week 1 feel like a distant fever dream.

Impossible as it is to believe, Jets fans actually had some semblance of hope way back on Sept. 8. Even if many were initially lukewarm (at best) on his hire, most entered the season open minded on Gase; at the very least, fans appeared eager to see what their new man could do.

Now, they just want it all to end as quickly as possible.

All it takes is one scan of the Jets’ Twitter mentions to realize that fans are clamoring for their head coach to be fired – pronto. Click on anything the team posts about Gase and the stream of toxicity is jarring.

“Jets fans need to boycott the remaining home games.”

“Worse than Kotite.”

“Just leave already!”

That’s just a taste of the PG comments. Hundreds of others would leave sailors wide-eyed.

But it’s worth remembering that Jets fans didn’t always curse every mention of Gase’s name. In fact, for many, the promise and belief they were fed this past summer seems to be a key driver of their current anger.

Back before kickoff in Week 1, NJ Advance Media spoke with 15 Jets fans filtering through the FanDuel Sportsbook near MetLife Stadium. Nine of them were confident enough to throw money on the team in some shape or fashion. Four poor souls picked this team – now the clear-cut worst squad in football – to win the Super Bowl.

Gase had people buying in. Literally.

“I thought he overachieved in Miami,” Mike LaManna of Secaucus said that opening Sunday. "People think he underachieved, I thought he overachieved with that team. He went to the playoffs the first year. He had a winning record when (Ryan) Tannehill was his quarterback. The rest of his quarterbacks were awful. He has a great record in close games and that’s the sign of a good coach to me. I’m very, very high on him.”

LaManna – who sunk $250 on the Jets to win it all – didn’t stand alone.

There was Luis Gonzalez of West New York, who believed in Gase “100 percent.” There was Kerry Demitriou from River Edge, who thought Gase could “drum up some plays that should fool a lot of defenses.”

Then there was this rave review from Robert Light of Wappingers Falls, New York: “We came to some preseason games. We sit really close, so I’m able to see what Gase is doing, what (defensive coordinator Gregg) Williams is doing, how they’re interacting with the team. As opposed to last year and the year before with Todd Bowles, you saw the disconnect, you saw guys just off by themselves. This team just seems more together to me.”

Nine weeks later, this fanbase’s assessment of Gase’s performance couldn’t be any more opposite. Just take it from Vinton Simpson.

“Honestly, when I watch him on the sidelines, he looks a little disinterested in the game," Simpson, originally from Piscataway, said. "He looks a little bit confused ... It just doesn’t look like he’s in touch with what’s going on.”

Simpson was one of 10 Jets fans – a mix of locals, transplants and travelers – that spoke with NJ Advance Media inside Hard Rock Stadium prior to Sunday’s debacle.

Unsurprisingly, not a single one was in Gase’s corner. Eight of them had already given up on Gase or were leaning in that direction. Just two were willing to withhold judgment; both fans gave him some leeway because of the Jets’ extensive injuries

Nine of the 10 said Gase should be fired with a loss to the Dolphins. That was their breaking point.

“Oh, yeah,” said Katheline Philias, a New York transplant living in Miami. "They better not give the Dolphins their first win.”

Sorry, Katheline. But here we are.

Losing understandably erodes trust. Even so, eight games is a remarkably small sample size – and most of these irate fans admitted that.

So what is it, really, that’s made Jets fans turn on Gase this quickly?

The common theme that emerged among fans was that – at least to their eyes – the labels attached to Gase this offseason have proven wildly inaccurate. In short, they feel like they were sold a bill of goods.

Acting owner Christopher Johnson billed Gase as young and energetic.

Alan Liszewski doesn’t see it.

“Some teams have no-names and they’re giving you everything they’ve got," Liszewski, formerly of Middlesex, said. “Here, it doesn’t look like everything we’ve got.”

Players, like running back Le’Veon Bell, described Gase as a “mastermind.”

Good luck convincing Johanne Larosiliere.

“The offense is stale and he’s an offensive guy," Larosiliere, who grew up in New York, said. "The play calling is not up to par from what I was sold that he would be able to bring to us. I get Sam (Darnold) was sick for three weeks, but to me, that’s not an excuse.”

Johnson advertised Gase as a leader of men, too.

Chris Foxx isn’t having it.

“He doesn’t take ownership for his mistakes," Foxx, of Miami, said. "He always try to point the finger at somebody else.”

Even Hall of Famer Peyton Manning got in on the hype, tabbing Gase as a quarterback’s best friend.

Simpson thinks his five games with Darnold have proven otherwise.

“I don’t think they’ve connected at all, to be honest with you," Simpson said. "Sam just looks a little lost, it’s frustrating … I think as a second-year player in the NFL, he should look a little more polished.”

All of that false advertising, combined with Gase’s 23-25 head-coaching record prior to this season, is what’s left fans like Vick Ganesh shaking their heads.

“There’s so many people they could have hired, man," Ganesh, a New Yorker living in Plantation, Florida, said. "I don’t know why they hired him.”

If Ganesh and his brethren have their way, Sunday’s loss will help convince Johnson to re-examine those other options. Soon.

Matt Stypulkoski may be reached at mstypulkoski@njadvancemedia.com. Follow him on Twitter @M_Stypulkoski. Find NJ.com Jets on Facebook.