I'm not sure why that deserves a "to be fair." I see blatant racism in my Nextdoor in DC too. There's a problem here, but it's not caused by reporters.
I see quite of it here in Portland, Oregon as well. Certianly more “those people” are a problem posts than I would expect. There is definitely a lot more ire directed at the homeless, but the (apparent) insularity of NextDoor appears to encourage people to show their true colors.