Try focusing on your job with a crowd of angry people booing & heckling you...how focused would you remain?
Why is it that some fans have the misconception that pro football players don't have the same emotions & limitations to breaking points that all humans have? The negative fan behavior has been occurring since the MLB All Star Charity Game when fans booed Cassel. It has occurred every pre-season & regular season home game. It wears a human being down, I don't care who you are or how much money you make...you're still human.