I don’t think it’s that, and I don’t agree with their post.
Night Elves aren’t just salty because they’re not being worshipped, but because the faction got clumped in with another faction. Which, on its own can be problematic, but not necessarily badly handled. The Horde’s a lot of things jammed together, but it mostly works. Mostly.
The Night Elves got jammed in with the Human faction, and while they’re not a background race for Anduin/Varian/Jaina like most Alliance races, their role is arguably worse - they get their moments, but those moments have nearly all been “get victimized by the Horde so Varian can save them”.
If you do low level Night Elf quests, they’re pretty much all “these guys used to be our allies but they went crazy now kill 12 of them”.
And it brings up another point: why make a race whose only purpose is to suffer?
The most imaginative thing they can come up with is “what if we make them suffer more, but make it more extreme?!”
That’s just lazy.
Just because there’s reasons to be annoyed with Night Elf posters doesn’t mean they’re flat out wrong.
Edit: Also, I don’t think the empire comparison really works because the playable NEs are the ones who rebelled against that very same empire 10,000 years ago. I’m pretty sure that Azshara played a bigger role in carving out an Empire from the trolls than Malfurion or Tyrande. Whether you love or hate the race, it doesn’t make sense to clump those different factions all together, especially since some literally became new races like Satyrs and Naga.