Although I agree that there is a difference between where regular/lifelong blues congregate and where tourists /families congregate, judging how much noise one makes from their bank balance is rather unfair.
You can be 'Shameless' yet still not sing in the ground, whereas I know of some blues who are middle class /wealthy and will sing more than I do.
It's all about group dynamics as when the wealthy dude is in the middle of the singing section, he is jumping around, singing, just like the rest of us... Whereas when he visits friends in the Hospitality section, he wears a suit, never sings and all the rest of it.
And this is why atmosphere overall in the stadium is shit at most (if not all) top flight clubs is because it's full of daytrippers.