There's also the small but not insignificant chance that if you are a) quite thick and b) in possession of a ticket for a seat near drummer boy your hearing is likely to be poor, limited and selective.
Heard the Brighton fans loud enough on tv. Palace were loud a couple of times too but most of the time all you could hear was that little James Blunt with the drum. You could have a crowd of 500 and claim to be loud if some spotty Herbert with a drum the size of Sweden turns up.