I may be wrong, but i think the idea is that (seriously, how the hell am i better than these chuds at explaining their own ideology):

The left (supposedly) hates beauty and tradition and nice things, which is why we (supposedly) support disabled and fat people in modeling and beauty magazines (also trans people, i guess). So a conventionally attractive young blonde woman becoming a sex symbol is an attack on the left because it proves that no matter how much "the elites" try to push other beauty standards (the ones i mentioned earlier), "the people" will always choose blonde women with big breasts.