If that were true, they'd be doing something against them. They're not.
Keeping your really cool toys to yourself and having a fun time for three thousand years on a fantasy island isn't an act of hate.
It may have started with some hate, and some fear, and a lot of exasperation, but even the way Trevor is treated on the island is not with hate. They aren't particularly kind to him (or to Candy), but I don't see hate. Much as this Diana was planned as an act of vengeance and hate, but grew far away from that and better, I think all of their culture clearly did.
Women do plenty of body-shaming, too. Particularly of anyone who doesn't look like the majority or what they prize, which she doesn't. That's not new to the world, and they've had three thousand years of cultural growth. They're just a teensy bit conceited.
I could've done without it, because I like their culture when it's simply and purely much better than what we have. But, as an element of a culture, it's a pretty universal element. There's always some body type, some look, that a culture is unnecessarily critical or dismissive of and we could all probably do with getting past that. Which, seems to be the point, here, since Beth is right and they're not.