There's a trending post about how Mean all those people who complain about the Fediverse are. After all, Not All Fediverse Users!
A comment about how racist Mastodon can be doesn't do Anything To Hurt You. Being the victim of racist bullying, which can and does happen here, Does.
If someone wants to vent about it in a goddam open forum, no-one has the right to dismiss this because Their experience has been rosy and sparkling. That's the definition of privilege talking.