"Gamergate" seems like the people who are involved specifically with the corruption and stuff and Antigamergate sounds like the people against it. But what the hell do I know?
The people who support the gamergate movement are for the idea of equality and transparency in journalism. They do not believe developers should be given special treatment from the journalists, nor should the journalists be given special treatment from the publishers. Such a system is not conducive to accuracy in reporting.
The people who are against the gamergate movement feel that the tactics used in support of the movement are unfairly antagonistic towards women in the games industry. There has been a long trend towards the subversion and silencing of females in the entertainment industry, and as recent threats have been usually targeted towards those who purport feministic ideals in the production environment.
The people who support the gamergate movement however also feel the conversation is being unfairly directed towards these feminist issues, and is in effect silencing their struggle. This unfortunate opinion was further cemented after various websites decided to ban discussion on the topic as opposed to allowing the issues present to be discussed. These websites at the same time felt they were targeted by gamergate and would likely have supported the feminist movement they saw as the enemies to their enemies at that time. The fact that one feminist ideal is the equal representation of women in games as they expand into the public plane also leads the gamergate population to feel fear over their alteration of their preffered pasttime and in what they view is just another form of censorship.
The people against the gamergate movement have as well unfortunately responded with hostility, as many of the attacks on the conversationalists target those with feministic ideals, even unrelated to the gaming or journalistic industry. In fact when the situation started, while people purported the signifigance of journalism, the attacks focused on a game developer, one whose game was not even rated by the journalist she supposedly attempted to accquire special treatment from. That soon after threats were levied on any supporters of this lady also further defined the potential loveist implications of the public response.
This unfortunately and effectively entangled and put at odds these two very important discussions.