Prejudice is much too generic imho.

“Races” in racism are (socially constructed, as you said) classes assigned from conception/birth, which racists believe to have class-specific inherited (often behavioural) traits.

The only functional difference between (classical) racism and the (star) racism of astrology is that one claims inheritance via genetics, the other inheritance via “vibes” from star formations.

Star racism is still racism. I don’t make fun of it, I simply reject it as esoteric bigotry.

If you want to do the least amount of tech support: Fedora Kinoite.