Tony Avelar/Associated Press

San Francisco 49ers cornerback Richard Sherman ripped Baker Mayfield after Monday's 31-3 win over the Cleveland Browns, saying the quarterback lacks respect after refusing to shake the hands of 49ers players before the game.

"What's amazing, and annoying, was him not shaking hands at the beginning," Sherman said, per Michael Silver of NFL.com. "That's some college s--t. It's ridiculous. We're all trying to get psyched up, but shaking hands with your opponent—that's NFL etiquette. And when you pull bush league stuff, that's disrespectful to the game. And believe me, that's gonna get us fired up."

WKYC's Ben Axelrod relayed video of the 49ers' Instagram story that showed Mayfield shaking hands with San Francisco players before the coin toss, although his interaction with Sherman is not visible:

However, a second video from Levi's Stadium appears to show Mayfield and Sherman shaking hands:

On Tuesday, Sherman clarified that he was upset with Mayfield for leaving midfield quickly after the initial coin toss.

"That's it," he told The MMQB's Albert Breer. "They are making way too big of a story of a blowout. He pissed us off. We put a foot in his ass. End of story."

Sherman initially said Mayfield's standoffish attitude made him want to "humble" the second-year quarterback. He picked off Mayfield less than two minutes into the game, setting the tone for what turned out to be a sterling 49ers defensive performance.

Sherman continued:

"Respect the game. You can have rivals, but pay your respect in that moment—especially when you're young.

"He hasn't earned anything in this league. How many games has he won? He's acting like he was the MVP last year. If [Patrick] Mahomes did that, it would be one thing. But he would never do that, because he has too much respect for the game.

"And when you see a guy who doesn't? You humble him every chance you get. Because eventually, he will have respect for the league—or he'll be out of it."

Mayfield finished with just 100 yards passing, completing eight of his 22 attempts and turning the ball over three times. He's thrown an NFL-high eight interceptions and is one of the biggest disappointments from a performance standpoint in the 2019 season.

The Browns' loss dropped them to 2-3, while the 49ers are a perfect 4-0. Mayfield has a history of bristly relationships with opponents dating back to his collegiate days at Oklahoma, so it's of little surprise that he rubbed Sherman the wrong way.

However, Mayfield's bravado has not been backed up by his performance. He's been among the worst quarterbacks in the NFL this season, and Sherman is probably right that his actions aren't winning him any friends.