I have lived this.
...Fans of classical music are widely perceived as cultured and
sophisticated and unfailingly polite, but this is an urban myth. The
savage, conscienceless, blue-haired ladies who attend the afternoon
concerts at Avery Fisher Hall will break your legs in the mad stampede
for the exits at the end of Handel’s Messiah. People routinely
bring sandwiches and soda and coffee into the concert hall, fan
themselves with their programs, crinkle paper bags, and take an hour to
unwrap the foil-entwined lozenges they should have popped into their
mouths at intermission. They giggle and whisper and refuse to turn off
their cell phones and just generally behave like slobs...