I’ve noticed a racist undercurrent in my local NextDoor feed. Not terribly visible, and not universal by any means. I encountered a new acronym there — I don’t remember what it was and don’t care to — for Black people, implying that they are inclined to criminal activity (it’s a white neighborhood). Someone felt that it was important enough to both use it and spell it out for the rest of us.
Mostly, what I am seeing in NextDoor is useful public service announcements mixed with idle neighborhood gossip of a sort that I want nothing to do with. I subscribe to an email summary, and read the individual posts very selectively. It’s an imperfect but useful tool.