Still, although we can wish for politeness in general, we can't really blame the fans for liking what they like, for supporting whom they support, for wanting to see what they want to see. Criticizing fans fans for not liking what you and I think they ought to like ...it just doesn't work that way.
I think concert-goers should like more Haydn and less rock-and-roll. But they don't.
The concert-goers aren't buying up all the tickets, skipping the early bands to leave them playing to a near-empty house, showing up right before rock-and-roll, and leaving disruptively during Haydn, though.