It's pretty clear that he's not a net value to Python development. But perhaps his attempts at contributing (no matter how clumsy) have value for him? I imagine it must be pretty lonely being the only geek with deep Python knowledge and interest in Minsk. I realize he's making it hard to be compassionate. But I still think what sets him apart from the typical troll is that he doesn't do it because he likes disagreement. He just lacks social skills (English not being his first language may contribute here). And yes, he doesn't seem to be learning from the feedback he gets.
Well, is he even interested in learning? He sticks to his preconceived notions about basically everything, including how a community should function.
The only saving grace in his behaviour, IMO, is that he doesn't try to annoy non-core developers.
Regards
Antoine.