Red hair is prettier,* but that's more associated with the Irish and other "lesser" peoples, rather than the nords and anglo-saxons, among whom blond was the designated bright color. This shouldn't be surprising since this is all rooted in Aryanism and the like.

I think you're also right about the youth thing, though it's worth noting that "dirty blond" hair gets noticeably brighter if you get a good amount of sun exposure, which I think is part of the "Americana" aesthetic of being tan with bright blond hair.

It's always really funny in a sad way seeing hard right people feel marginalized not even by a society that hates their bigotry but by a society that embraces it. For example, t's a perennial issue for Lauren Southern, a proto-fascist great replacement influencer type that she has trouble with the ridiculous levels of misogyny of people in her sphere. At least if I ever personally knew someone with these issues, it might be a good opportunity to reach out and say "Hey, maybe what is hurting you is a part of this ideology rather than an aberration from it" or something.

*Yeah I'm biased but come on, it's a more interesting color to occur on a human while blond is just a really light shade of brown when you get down to it, meaning it's fundamentally a difference it brightness between itself and all the shades it is supposedly more desirable than.