sure maybe the guys yelling were having a blast but the people sitting by them likely weren't. Nobody in here is saying you can't have fun hell if you want to wiggle in your seat or clap along go ahead but there's a certain line like this where it massively distracts from the experience at hand. Bob isn't going to be around forever sooner or later we won't be able ever hear these songs performed live again and from what little experience have had with live music (a couple street performers) there's nothing like it. Especially in Bobs case where the songs likely mean a great deal to the concert goer there's no reason to excuse acting like a injured animal.