I think it's less so entitlement and more so just being bummed that such cosmetics seem beyond them. Speaking as a casual player who doesn't do high-end content, there is a reason I don't. And it's not because the content itself is too hard. It's because of how intimidating the preparations are.

You need to have the best current gear, preferably overmelded with the best and CORRECT materia. Perfect stats. Best high-end raid-tier food. Etc.

When a person who wants to attempt savage sees all of these things they have to do, they will have one of two reactions.

1.) All right, this is fine.

2.) *petrified with anxiety*

Number 2 happens a lot because no one wants to be the one who accidentally melded the wrong materia, didn't overmeld at all because they couldn't afford it, or ate the wrong food. Because then you wind up feeling like you are dragging the party down because you didn't go into it with 100% perfect everything.

And maybe raiders will say, "You don't NEED to be 100% perfect to clear" but that is absolutely the perception from casual players like me who watch raiders spend millions of gil overmelding and getting their hands on the absolute best of everything.

TL DR High-end content feels extremely intimidating and insurmountable for most casual players due to the perceived expectations placed on them. Therefore, they get sad that they are missing out on cosmetics that they feel like they cannot and will not ever get.