Possible Clues:

• Serenaded the umpire?
• Was a rude member of the gallery
• Greeted a Yank at Fenway?
• Shamed for taking steroids, perhaps
• Like the bad guy
• Serenaded the ump
• Threw tomatoes, verbally
• Expressed disapproval
• Reacted to a bad call, say
• Didn't support