I can't think of any off of the top of my head, but I am sure there are several. Regardless of what other poor sports have done, not sure sure how you excuse bad behavior for another based on others making the same mistake.

I also have a hard time feeling sorry for a guy who does 3 dances every time he scores and actively mocks the rest of the NFL telling them if they don't want to see the dances then stop him. Well he got stopped big time and acted poorly on top of it. Funny how easy it is for him to dish it out but then he can't take it (and in this case it was only losing the game).