I think the crowds get out of hand at times, but I think they are a net positive. It's a chance for most of these guys to get one last big reaction. It's a nice moment more often than not.
Crowds would be fun if they weren't such shit marks. Unfortunately being an asshole is now considered "fun" so here we are.
Respectfully chant a bit, applaud, all good.
Don't boo. Don't chant that anyone sucks (could have went with "you rock", if you must and skipped the John Cena Sucks chant altogether). And for the love of Christ, don't individually shout out some random phrase for attention, you DUMB FUCK, it's not about you.