The gaming community is far from the only one under attack from SJWs, they've actually taken over or attempted to take over a surprising amount of subcultures and communities, from Atheism and Sci Fi to Occupy and Metal. What's interesting is how their approach always stays the same, regardless of what they're trying to hijack:

1) People who don't actually care or know much about the specific community or subculture nonetheless loudly declaring that said community/subculture is Doing It Wrong because it's insufficiently "Diverse", be it in its overall member composition, the makeup of its most popular representatives, the content of the products the group consumes or the pop culture image of the group in question.

2) The non-enthusiasts push a safety/inclusivity-oriented agenda as the solution to the diversity "problem". What this means in reality is imposing a whole lot of new rules amounting to a regime of political correctness, declaring that well-established, uncontroversial practices common among the enthusiasts are unacceptable and have to end.

3) Non-enthusiasts gain positions of power (or at least managing to influence those with power) by exploiting either the left-wing politics of the current leaders ("of course I want to support women/ethnic minorities/sexual minorities, what do you propose?") or convincing them that the "inclusivity"-agenda will increase their profits and/or influence, by attracting a bunch of brand new users.

4) It now turns out that the original members of the group no longer belong in this new, "Inclusive" community that SJWs are trying to create. It's justified by their unwillingness/inability to comply with all the new rules and abandoning their old ways, but really it's a way for SJWs to get rid of people who are a lot more popular and credible on the relevant subjects that they are. Naturally, SJWs end up insulting, dehumanizing and purging the original members in the name of "Progress".

So how do we best fight this? I've identified are two main approaches, though I would always recommend combining them:

1: Stop seeing Diversity as an end in itself - I'm of course talking about diversity as SJWs define it, not diversity of opinions. And I'm especially thinking about Male-dominated communities here - Men and women ARE as a whole different, have different preferences, differences interests etc. It shouldn't be a source of worry, let alone guilt, that there for example are more male than female hardcore gamers, no more than it should be seen as a problem that romance novels are more popular with female than male readers. Of course, only the former is deemed a problem by SJWs, not the latter.

And that's the core of it really - SJWs aren't actually promoting diversity in any and all communities, just those that have (or are perceived to have) a male majority, specifically a straight, white male majority. They always DEMAND safe spaces for themselves, but even the idea (and it's usually a completely unjustified idea) that white straight males might at some point have places for themselves absolutely enrages them, to the point of wanting to destroy the group in question.

Look, if women and minorities are actively being excluded that's of course wrong, but not having a group composition that 100% reflects the demography of your country is neither unnatural nor "problematic". Equality of Opportunity should be the goal, not Equality of Outcome.

2: Keep exposing SJW as a loud, but tiny group of fringe extremists - SJWs always try to make it seem like they represent mainstream society, and community resistance to their agenda is just a result of said community being out-of-touch with the Real World. As usual with SJWs, this is nothing but Projection - a country like the US is certainly not even CLOSE to being where SJWs want it to be on Identity Politics and Sensitivity issues:

http://nytlive.nytimes.com/womenintheworld/2015/04/09/82-percent-of-americans-dont-consider-themselves-feminists-poll-shows/

http://www.usatoday.com/story/sports/nfl/redskins/2014/01/02/team-name-controversy-public-policy-polling/4297665/

http://edition.cnn.com/2015/07/02/politics/confederate-flag-poll-racism-southern-pride/

https://archive.is/NpAd5

The SJWs insist that they are on the Right Side Of History, which is just a more pompous way of telling people to join the winning team, but pandering to SJWs never seems to result in actually Winning anything. Just compare Sunset with Hatred or HuniePop, or consider how ProteinWorld won big by actively antagonizing SJWs.

Pandering to SJWs is a losing proposition, while telling them to go fuck themselves will probably earn you a lot of money and support. Now that #GamerGate exists, we can even counter media lies and sabotage SJW social media slacktivism attempts to Shame and Bully dissenting voices into submission. Bottomline: SJWs do not have to be your audience - SJWs are over.