They aren't complaining about being sexualized, as far as I can tell. They are complaining about being harassed. And the fact that some men get their rocks off on violence between women doesn't make the concept inherently sexual. The first page of google hits on that term include a film about a woman boxer and a women's martial arts academy.
I purposefully used Bing instead of Google, because Bing does not filter NSFW and Google does. I did that because it more accurately represents the topic at hand. Google's results, in this case, will skew towards "girlfight" being more or less innocent of innuendo, which is simply not representative of the topic at hand.
What is the difference between being sexualized and being harassed, in this specific case? It's the difference between what I think (they want me to think about sex when I see their brand; they chose a name that would provide some level of flirtatious innuendo) and what I say (they don't want me to actually tell them I think about sex when I see their brand; they only want passive attention that furthers their own interests).
I am in no way arguing that sexual harassment does not exist. I'm not even arguing that it isn't a huge problem in the gaming industry. I am saying that Girlfight is a poor example if the goal is to generate dialog and, eventually, change.