Plenty of people find extremely skinny people attractive - it's one of the reasons anorexia can be a problem, people feel compelled to go without food because they're trying to attain a body shape that isn't achievable while staying healthy in order to conform to a beauty standard. Plenty of people find larger people attractive, and at other times in history this was the dominant attitude.

This is just smuggling your preferences into a frame of objectivity with some spurious comparisons. You're ignoring the is-ought problem [1]. You can tell me a long stream of "is" claims ("this person is obese, this person is anorexic") but you can't actually come to a conclusion about beauty without making or implying an "ought" claim ("you ought to look a certain way"). The rhetorical game here is that, if you leave it implied as if it were obvious and required no justification, then you can pretend that it is an "is" claim instead of an "ought" claim in a trenchcoat. And if you pretend that you've made your argument using only "is" claims we can all agree on, then you can pass it off as objective. But it's mere sophistry, and once you understand how it works, it stops being convincing.

Even if we accepted your framing here, very few people are anorexic or obese or in another extreme state at a given time. So by your logic, surely the vast majority of people are beautiful, and we still don't need to go around policing who gets to feel beautiful.

> (Intelligence is a social construct, says a member of the only species intelligent enough to hold that notion.)

This is does not contradict any claim I made. I'm guessing you've conflated "socal construct" with "fictional," but that's not so. Voting and being elected are both social constructs, that doesn't mean Joe Biden isn't the president of the US. Being smart is real, as a concept, but reasonable people may disagree about the definition or about who is smart, and it's possible for none of them to be wrong.

[1] https://en.m.wikipedia.org/wiki/Is%E2%80%93ought_problem