Those commentary videos are fully capable of being some hateful stuff, especially when it's delivered by some hateful people. Unfortunately, fans are often very reflective of the thing they're a fan of, and some opinion pieces on Leafy I've found via interwebbing seem to indicate that he just...
Is there much more to it? Sounds like a YouTube personality with some stupid and hateful opinions he wanted to voice was banned from the platform that let him voice them. Doesn't matter what anyone else did, it matters what he did.