It honestly just sounds like some butt hurt girly man who for some reason felt like he needed to single out a character that (for the most part) doesn't get the same treatment like some other female protagonists/antagonists (ahem....Ayane, Ivy, and Bayonetta, FFX-2 girls even). All because she is wearing a (non stylish-like) jump suit (with heels) which BTW looks more professional than the combat suits the DOA girls wear in games like Ninja Gaiden 2/3 RE.
Plus (from what I'm reading) he fails to differentiate between vulgarity and elegance. Sure one might point out her heels but that's the least of the problem if you're focusing on what might be construed as sexist. She might have (slightly) larger breasts, but they're no bigger than some of the other female character's breasts IMO. Not to mention they don't animate her breasts like in DOA, nor she doesn't flaunt her body like Bayonetta.
His comparison about men getting the same treatment is laughable (again can't differentiate vulgarity/elegance). Guys get the same treatment (he fails to see it) in the form of slim but ripped body (shirtless sometimes), chiseled face. Sometimes a fully ripped body. A man doesn't need a bulging crotch to look (appropriately) sexy; much like with a women, she doesn't need her camel toe sticking out. Men/Women don't need to wear thongs/scantly clad attire to look sexy.
Apparently battle-ready skin tight jumpsuits (that cover the whole body) with stilettos is so sexist to this knucklehead that it warrants a complaint. Unlike a fighter like Ivy with big, partially covered boobs. Plus she's been wearing that jumpsuit since Metroid Fusion. That was over 10 years ago nobody said anything then. Hell at least she's no worse than Wonder Pink if you know what I mean.
BTW what woman would want to see Captain Falcon wearing a thong in battle (let alone a man). Id rather have him wear the "bat nipples" instead (thanks Joel Schumacher).
