Because this guy does NOT allow divas on his team.

Today during the weekly San Francisco 49er drubbing, Vernon Davis earned an unsportsman-like conduct penalty. As soon as he got to the sidelines Singletary chewed him out and kicked him off the field.

“It’s something I told players at the beginning of the week,” Singletary said after the game. “I will not tolerate players who think it is about them and not the team. We can’t make decisions that cost the team, and then come off the sidelines and it’s nonchalant. I’d rather play with 10 people and just get penalized all the way until we have to do something else. Rather than play with 11, when I know that right now, that person is not sold out to be part of the team. It’s more about them, than it is the team. You can not play with them. You can not win with them. You can not coach with them, can’t do it. I want winners. I want people who want to win.”

“I told him he’d do a better job for us right now taking a shower and coming back and watching the game than going out on the field, simple as that,” Singletary said.

I ripped a video of the “altercation” .. but i have to apologize for the quality, I was testing out something new and it didnt come out right. Check it out below.

Here’s Vernon’s response ….

Shaking his head in the locker room, the 49ers tight end said, “Not in my head. I don’t think I did anything wrong. But when the coach thinks I did something wrong, I gotta listen to him. He’s the boss.”

Davis is no stranger to trouble – he is easily the team leader in practice-field fights and memorably had a swinging match with veteran guard Larry Allen in training camp in 2007.

He tried to approach Singletary in the locker room after the game, but Singletary told him, “You do not want to talk with me now. I assure you, you do not want to talk to me.”

[SF Gate]