Well, the Ms. Marvel argument misses the point entirely, because the sexism in that scene wasn't the Doombot calling her a piece of furniture or whateverthefuck, it was that Carol actually cared, and Wonder Man had so little respect for her that he immediately tried to reassure her that no, she wasn't a cow, and then Carol got that much more insecure. The idea that Victor von Doom calling Carol fat was some kind of meaningful blow to her ego and self-confidence was a million times more insulting and sexist than anything Doom himself could have said.
Other than that you're spot-on, though. "What's wrong with an evil character acting evil?" as though all evil were interchangeable is such a shallow, juvenile way to write a villain. See also: Magneto, Deathstroke, and to some extent Barbara Minerva.