Hang on a minute. This discussion has been framed around disagreement while the bans have been for hostility. Let's look back through how this all started in relation to that. 'OK dude' was in response to Windrunner being called a 'gammon.' I don't know how much UK parlance you are aware of, but this was a woman being called a red-faced, angry, far-right racist middle-aged man. While 'OK dude' can of course be dismissive, you've left out some context here, I wouldn't describe calling someone a gammon just "'confronting them". It's a massive escalation in hostility, the UK equivalent to calling people a Trump supporter, which is why several bans (in addition to other insults flying around) have been for hostility, not disagreement. Robust disagreement is fine, valued even, but you can't claim that people have only been banned for disagreement while glossing over the escalation that followed calling someone a far right angry white male bigot. How can discussion happen if the first sign of disagreement is immediate escalation to 11.