Gamergate is also a product of years if not decades of pandering and coddling to a certain segment of gaming consumers telling them that they are perfect and great for buying all these products, while the products themselves were power fantasies aimed at pleasing the player as much as possible. Meanwhile, journalists and reviewers never bothered to ask critical questions about the status quo while lauding everything with positive acclaim, despite their problematic politics. Additionally, marketing was constructing a myth about who played games and what type of identities were 'allowed' in the Gamers club.
When you then rock the boat by asking critical questions or being another person, the sycophant Gamers lose their shit, especially when nobody else with power in the culture and industry calls them out on it. Then you have some people who lack basic empathy and understanding, and these turn into bigoted Gamergators.
This form of online bigotry is unique to gaming culture. Other domains online experience similar type of hate, but Gamergate is particular to gaming culture.