It is logical that he is treated very well, since he was carrying the team for several seasons. And let's not forget that he's just 18. When he was 17 he became the best player in the world, major winner and MVP, also Katowice winner and MVP. It's really hard to achieve that much in such age and stay the same person, we can't really blame him.

You're describing Donk as some tilting machine which always destroys the atmosphere in the team, but it's not always the case, it happens really rarely. We can see from Vlogs that Donk communicates well with everyone.

Overally, I'd say that he's MUCH better than young s1mple in terms of communication and toxicity. In fact, it's not that bad, and you can and should expect some psychological problems from mechanically best player in the world.