As much as how some of them could be right in dudebros being critics, said dudebros aren't the only ones. Other examples include us kiwis who have our own reasons to criticize the designs and it isn't because we would get aroused by the boob window on some super heroines costume. Rather, some of us would see a design as lazy or probably not too consistent with a character or their world. I will say though that some if not, only myself aren't really familiar with some comic book character. I don't know if Red Sonjas world is now more like say Skyrim than some sword and sorcery barbarian world but honestly, there are some artist that could do it better in redesign.
On an sort of related note, some guy makes a top 10 list of most sexist heroines still being published
http://whatculture.com/comics/10-most-sexist-comic-superheroines-still-being-published-today.php
The comments do take a jab at the author though. Also one thing I must say, looking at Power Girl and comparing her to Red Sonja or Star Fire, how is a unitard with a boob window worse than what Star Fire wears of the chainmail bikini of Red Sonja?