There's too many to mention but I would have to say Mike Irvin! That dude ran his mouth and when he won, rubbed it in more and more...not a good winner! I hated that man during the 90's when they were winning Super bowls. There are so many players, not playing for the 49ers, that I've hated and I guess I could just say, if they "ain't' playing for the 49ers, I hate them all! But, I was a fan of many other players like Barry Sanders, Adrian Peterson, Randy Moss, etc.
Who is the one player over your 49er fan career, not playing for the 49ers, that you just couldn't stand?