It's long and complicated because of a lot of pointless internet drama, but the basics go something like this:

A woman named Zoe Quinn develops a game called Depression Quest and got a lot of buzz on various game sites such as Kotaku. Her ex-boyfriend then writes a Tumblr claiming that she cheated on him with five guys from the industry (one of whom worked for Kotaku) and tried to gaslight him about it, which would kind of contradict her claims that she cared deeply about mental illness since he has a history of issues.

This leads to a lot of people calling Quinn a whore and making unsubstantiated claims that she slept around expressly for the purpose of getting coverage for her game. This in turn, along with the negative reception to Anita Sarkeesian's Tropes vs. Women, causes several game bloggers to write posts about how gaming isn't just for straight white males anymore and to make the hyperbolic claim that, "Gamers are dead." At this point the whole thing erupts, with one side forming up to protest misogyny in gaming while the other side protests nepotism and corruption in game "journalism", meaning that both sides just talk past and harass each other and never shut the fuck up about it.

No, it's best not to care.