Being a 20-year season ticket holder doesn't give you free reign either. Sat near a guy like this constantly shouting and berating the (Devils!) players during the game and it was unbelievably annoying. He was like the real-life version of one of the trolls on this board who only make negative posts. (I would not be surprised if it turned out this guy is actually one of the trolls on this board.) It was a huge relief when he left halfway through the game.
Entitlement is the exact right word for this situation. Your ticket entitles you to watch the game, no more. It doesn't entitle you to act however you want in the arena to the detriment of other fans' experience.
Every person I've ever been to a Devils game with who didn't know about the YS chant in advance has thought it was classless and stupid. Including my dad, who is a former season ticket holder. There are way more than just 2 or 3 anti-YS people.