I see now.
What's the difference between "pro-gamergate" and "anti-gamergate"? Does "pro-gamergate" mean you're for calling out the shenanigans or you're against that?
Anti-Gamergate means you support the bloggers and believe pro-GG people are basement-dwelling misogynists. Pro-Gamergate means you support people like Total Biscuit, InternetAristocrat, AngryMatt (forgot his actual name) and believe that anti-GG people are all SJW hipsters who don't care about gaming and want to bring their agendas into everything.
It's a bit confusing, but basically the pro-GG people think that Gamergate is a positive thing, since it brings awareness to the problems going on.
tl;dr "pro-gamergate" means you're for calling out the shenanigans"