C'mon now, that's a stretch..... It's stubbornness or just being immature. I'd chalk these reactions up to more what Colorado Rockies 1976 is saying, a mistrust of the new ownership, or even more, just a residual effect of all this losing.
My brother's in his mid-30s and even he took part in the "You suck!" chant over "Seven Nation Army".... It's not a kids vs. adults thing. Most of my section in 119 was saying it, a lot of the arena seemed to be saying it. It's just a battle the new ownership did NOT have to make their top priority first thing in a season, and ill-timed during a losing streak.
Thinking you should be able to say "You suck!" at an arena is not "entitlement", and I've heard that word misused many times.
Again it is entitlement when certain think the ownership is going to change their stance all because people are whining and threatening to cancel their season tickets over a friggin goal song. Its basically a temper tantrum from children and man-children.
I think a lot of people who are in the pro you suck crowd really underestimate the number of people who are welcoming this change. When stuff like this happens, usually the people who are satisfied are generally quiet as they are happy with what they received while naturally the whiners will be louder.