I agree with most of what you have said, except for this:
" Biologically, we are wired to want to have sex with people who can procreate. This is deep inside of us ,outside rational thinking, so even if you don't want kids yourself, I think your reptilian brain may still be attracted to people who look virile or fertile to you."
if this were always the case surely no one would be lesbian or gay? and straight men wouldn't be attracted to really thin women who have lost their periods, for example?
Anyway otherwise yes, I totally agree about the fatphobic thing, that whole "movement" is insane at this point (and I say this as someone who is fat)