I'm thoroughly confused about that Gamergate video. Where are the forums, messages boards, and websites that are dedicated to the harassment? The only central place for everything seems to be r/Kotakuinaction on reddit. (which I have no idea why they'd call it that...)
And in that thread its about as far from what he describes as possible. Is he only looking on Twitter and 4chan boards? I mean...it's twitter. And 4 chan. It would be like me trying to demonize gaming culture by plugging in a headset on a 360 call of duty game and saying, just listen to how awful these guys are!
Is there some formal Gamergate website I'm not aware full of terrible people? I think they're just pointing to twitter posts. I mean try posting your messages on something that allows people filter your reponses so the worst posts don't get all the attention. (upvotes/downvotes)
If you try and post something trying to discuss the subject on r/games is just gets deleted. So it seems important to note that the options for discussing it peacefully are being taken off the table and it's either twitter or some random place people won't know how to find.
Edit: Just tried searching GamerGate in r/Games specifically and amazingly there are two posts that got a decent amount of comments and are still there. If you look over the comments section it's just normal banter and that is what you get when you let the majority filter out the unpleasant people. It's definitely this way with r/Kotakuinaction but if this subject was so toxic you'd think they'd be happy to keep reddit threads up to refer to for examples but all I see anyone pointing at is twitter nonsense. Don't use twitter to debate something. It's common sense that is a terrible idea.