So... People are just unhappy they gotta pay is all, instead of raid reward.This is a grotesque oversimplification.
I can guarantee you that many of the people upset by this sort of macrotransaction exploitation of game content are very capable of purchasing the item if they want it. In fact, I think there's a lot of anecdotal evidence floating around that some of the biggest "whales" and "transaction-enjoyers" tend to be people who are actually not in a financial place to really be doing it — a commonly-seem outcome of addiction and FOMO-manipulation mechanisms throughout modern commerce.
It's true that if you throw enough darts at a large enough population, some of them will surely strike something — so I'm sure that "some" players indeed are "merely" angry at needing to spend real money on a cash shop mount, with no other concerns.
However, I will, again, outright-guarantee that many others are more than capable of trivially-affording the price, and their hostility instead stems from what they want out of a game, and how they want games to distribute rewards. They believe that this is inappropriate or unsatisfying "gameplay" (or lack thereof), and they dislike the idea of obtaining something without actually "playing the game" — especially something that feels closely-tied to content or story that they feel connected to.
This should not be a foreign concept to anyone old enough to be playing FFXIV — the idea that it's satisfying to most human beings to "work towards" rewards within a given context or system.
It's the same reason why we feel excited for athletes who work hard to earn trophies by playing a given game-system's rules, and rather apathetic towards individuals who simply purchase old trophies on eBay — even though, technically-speaking, the end result is the same either way: someone has obtained a piece of metal or crystal in a certain shape.
Trying to boil it down to "people just don't like paying money" fundamentally fails to understand what it is about gaming that motivates a lot of participants, and why the rewards have meaning beyond their literal possession.