I will grant you that a single scan does not demonstrate the sexism of a particular piece of work. So the specific comic may or may not turn out to be insensitive. But the thrust of the argument as I understand it is that women are portrayed as masturbatory fantasies across the entire medium of comics. So, like, a female protagonist may save the day. Sure. But just by dint of being in a comic she will be painted as some sort of idealized sex-symbol.
Comics as a medium lends itself to reductive portrayals of women that female readers struggle to relate to.
And the difference between women's treatment in comics (objectification, unattainable stylization) and men's treatment in comics (idealization, unattainable stylization) is the way that attitudes translate into real-world behavior. Generally speaking, comics nerds aren't terribly inviting to female readers. That is the root of the objection, I think.
Though both male and female comic book characters are outlandish and unrealistic, the treatment given to women is different from men (in a negative way). This is borne out by the treatment of female comic enthusiasts.
(And then there was the post where I tried to be gay enough for Nemebro. But you can ignore that one, because aint nobody gay enough for Nemebro)