Dessalines, right? I happen upon a lot of his Github issue threads on libraries that i use, which i think is interesting when i recognize the account. He seems normal there.
Other than that, looking at his Lemmy profile, it seems he gets into a lot of political arguments on subjects that i don't know much about - i can't tell if he's unjustly hateful towards any group. I have heard he bans people a lot over these disagreements, which isn't cool so i think your sentiment is fair.
Currently my only issue with .ml is the profanity filter but i don't know anything about the other instances either. I imagine this conversation has been had a lot already but if i'm on Lemmy either way, what's the difference in terms of support? If he's a dick, i'd probably rather just switch to Kbin or PieFed