Because lolis are everything that they are not. Cute, feminine, endearing, etc. They desperately want to be these things, but they know deep down they never will.

I have noticed the trans crowd has a special hatred for them, but leftist women tend to have that hatred too. And when I say hatred I mean independent from "eww its icky pedo stuff and I dont like it." It tends to stem from similar reasons as the trans crowd. Leftist women tend to be more likely to be fat, ugly, etc. So men idolizing something that is the exact opposite of them really strikes a nerve.