Jitank something to understand is that you're never going to make a tribal user not tribal by arguing with them over the Internet. I think the best thing you could do to convince someone like that that all races are equal is to set an example and act well. I don't think you're really doing that for them, right now.
I wouldn't go as far as to say your account is unsalvagable but if I were you I'd try to stay out of drama and political threads for at least a few weeks, and maybe change your avatar. I know I learn to associate avatars with behavior and I'm not quite so quick to judge after someone changes theirs.
Nobody associates a political crusade positively on the Blockland Forums, and while some users have very strong opinions about politics, nobody appreciates it when those are brought up either as a thread of their own or in unrelated threads. Also, as I've said before BLM is extremely unpopular and I think you might be more persuasive if you distanced yourself from the, just as many vegans distance themselves from PETA.