I heard Discord may have negative posts as well but I find the official D newsgroups (with a forum interface) very friendly and clean. Minimal moderation seems to help there.
We do our best to ensure everyone feels welcome to join in. Of course none of us have social media training and are just doing our best.
If something is going down and we are not taking action it may be because we are not aware of it being problematic and are always open to hearing complaints as they come up!
