You are not entitled to fuck up somebody's evening just be caused you paid the entry fee. There are still norms, rules, laws and traditions to follow at any event, public or private.
Obviously this is flexible because of you go to ECW One Night Only you expect Cena to be booed and its part of the experience. At a Raw Event for kids, drunk neck beard chants against everything and everybody can fuck it up for the families.
Hey I enjoy a John Cena Sucks chant but some fuckers are totally hijacking with their chants. The selfie/twitter look at me generation with an expectation of being noticed.