Why's Everyone Always Picking on Stomper?

That's Stomper, the Oakland A's mascot, getting ambushed by the visiting Kansas City Royals. Stomper is quickly becoming my favorite major league mascot -- perhaps because he's not too cool to mingle with the fans -- but he seems to have his share of enemies, from bad baseball players to that punk Lou the Seal and his henchman Crazy Crab from San Francisco. What gives?