To go along with this comic we have to imagine that women are not attracted to fit men. And while it is true that some women like femboys or dadbods, that is not the majority. A significant number of straight women are attracted to guys with gym bods. If that's correct, then this wouldn't be a false equivalence since both genders are being sexualized unrealistically.

Instead of calling it a false equivalence, I think the point could be made more diplomatically by stating that two wrongs don't make a right.