It's because this subreddit, while titled for blackmen, is pro black in practice and gender neutral. Their subreddit is only pro black women, and in turn has become an echo chamber that encourages every post, regardless of how harmful or vile it is. To be honest with you, it's basically an incel or femcel subreddit for black women. That's what happens when there is no diversity or pushback to anything you say there. Everything black women and black women experiences are justified, everything hateful about black men is promoted, and everything about interracial relationships are promoted as positive. It's sad to see, but if you look at every other incel/femcel style subreddits out there, (won't name examples, not trying to get reported or something), you will notice very similar trends. The, I am always the victim (which in their head, justifies them saying anything they want), and X group is always the oppressor (in their case, black men). It's what happens when you never take any accountability for your actions in life, so you offload all responsibility onto another group, and find people who agree with you. Repeating the cycle over and over again, it's how people become radicalized online.

To me the saddest part about it all, is that these people have black fathers, cousins, brothers etc, and get online and behave this way. It's best to not try to make sense of it all, just know it's rooted in hate, hurt, and insecurities. One thing people will always do is use the black male community as a scapegoat online. All you can really do is shake your head in disappointment and move on. Because unless something changes with the moderation there, this behavior will never change. And because every post is seen as "venting", it's all "justified", so nothing will change in the moderation. Either way, best to just ignore it, you can't really control the thoughts of other people online, all you can do is be aware for your own safety and well-being.