the problem with "she'd be hot if she were thin" is that it empowers the fatties.  they hear than and say "the truth is that this guy wants to bone me, but he's so held back by society that he cannot give in to his own desires.  the patriarchy is so evil..." never inflate the SJW egos.  not even once.  there is a reason that on reddit the comment box literally said this type of post would result in a ban.