So is the argument that Justin must be abrasive because he was booted from this forum? It's not hard to get kicked off a site. Just don't follow their rules. That doesn't make someone a jerk. Having read a lot of his blog posts and watched a fair amount of Justin's videos, he's definitely in the "sweet and extremely mild-mannered" category.
No, I think Justin is often abrasive in eg his blog comments; pretty much wherever he's dealing with other people. His blog posts & videos are not aggressive though. I'm not actually aware of why he got booted from here; but getting actually-banned from ENW does generally take a fair amount of abrasiveness I think, it's not like RPGNet!