TORONTO — What if Friday night’s biggest lesson at Rogers Centre must be applied not to J.A. Happ or anyone else wearing a Yankees uniform, but rather to all the aspiring umpires out there?

Look before you bleep.

Oh, sure, the Yankees’ nine-game winning streak concluded in ignominious fashion with Happ getting pounded to the tune of an 8-2 loss to his former team, the Blue Jays. The veteran left-hander, his ERA now at 5.48 after surrendering six runs — including three homers — over five innings, continues to be a major concern for this team that is virtually guaranteed a ticket to October yet faces enough starting-pitching questions to raise anxiety levels throughout Yankee Universe.

While we’ll keep monitoring Happ’s effort to master these juiced baseballs and put himself in the conversation for playoff consideration, that’s not what captivated you most about this ballgame. You want to discuss the most memorable moment, the heated dispute between young, 37-year-old ump Chris Segal and old, 35-year-old Yankees outfielder Brett Gardner that resulted from Segal throwing Gardner out of the game for a transgression he clearly didn’t commit and concluded with Aaron Boone restraining Gardner from getting in Segal’s face.

Mistakes happen. What must change, when it comes to umpires, is public accountability for those mistakes.

“Of course there’s not going to be [ramifications],” a still-fiery Gardner said after the game. “There’s no accountability whatsoever. [Segal] probably doesn’t have to talk to anyone about it, unfortunately. He wanted me going out of the game, and that was that.”

Segal, a Triple-A official who receives frequent call-ups to cover for major-league umps, most certainly will have to talk to his superiors about the embarrassing incident, and it’s possible Major League Baseball will communicate to the club that Segal erred — and Aaron Boone might very well share that communication with the media. There will not, however, be an official MLB statement condemning Segal. That’s a collective bargaining thing. And in this age of high-definition video and social-media detectives, no such announcement will represent a bad look for baseball.

The incident resulted from barking in the Yankees’ dugout over a pair of questionable called strikes by Segal in the fourth inning, the first a punchout of Cameron Maybin and the second the very next pitch to Mike Tauchman.

As detailed by the amazing @Jomboy_ on Twitter, after the Tauchman call, Maybin, seated in the dugout, yelled, “F—ing terrible, let’s go!”

Segal immediately responded: “Time, out, done!” and signaled someone was out of the game. When Boone inquired who had been tossed, Segal replied: “Gardner. He just told me I’m f—ing terrible.”

We all saw via replay it was Maybin, not Gardner. That stunning dismissal caused Gardner to emerge confusedly from the dugout.

“I told him I didn’t say anything,” Gardner said. “He told me I did say something. That’s why I got pretty irritated.” Gardner also called Segal “a liar.”

As is standard operating procedure, crew chief Dan Iassogna spoke to a pool reporter (which happened to be me) after the game, with Segal standing right behind him.

“I won’t comment on any ejection that happened out on the field,” Iassogna said. “It will be put on our report, and we will put in what happened on the field, and we will watch the tape.”

The tape won’t be pretty for them. Gardner said that Iassogna tried to calm him down and mentioned that Gardner had been knocking his bat against the top of the dugout, his signature move that he showed off last month in the same home game when Boone called his hitters “f—ing savages.” That would make for an interesting debate over dugout-knocking being an ejectable offense, except that the video shows Segal referencing the “f—ing terrible” and blaming the wrong person for it.

Asked if he wanted an apology from Segal, Gardner said, “Not interested.”

The fans should get it, though, the same way the NBA and NFL acknowledges officiating errors. These are new times with new expectations. In this case, to steal from “Love Story,” love — of baseball and of integrity — should mean having to say you’re sorry.