Richard Sherman says Baker Mayfield refused to shake hands during the coin toss before Monday night's Cleveland Browns-San Francisco 49ers game.

"What's amazing, and annoying, was him not shaking hands at the beginning," Sherman said. "That's some college s---. 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."

The 49ers routed the Browns 31-3. Sherman got some payback when he intercepted Mayfield on Cleveland's second offensive possession.

"Respect the game," Sherman said. "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."