I think it's both true that there have been racists in the industry and in the communities since the beginning of gaming and that white supremacists have also gotten better at fostering this culture of hate and connecting more people who have been holding these beliefs for awhile.
It fucking sucks that we've let it get to this point with our complacency. That's why it's incredibly important to call out racism, and every other hateful belief for that matter, swiftly and uncompromisingly.
We can be more understanding of teenagers and kids and try to reach out to them to keep them from falling prey to such beliefs.
But full-grown adults who have should have the mental and emotional capacity to comprehend the evils of discriminatory behavior and ideologies? We need to put our foot down, call them out, and hold them accountable. If you fuck up, you own up to it, apologize, listen to marginalized voices, learn, and grow up. Don't make excuses. Don't deflect. Don't lash out. Don't be defensive. Don't apologize half-heartedly. Acknowledge your mistake fully. Be better.