Social problems cannot be solved by technical solutions e.g. “turning the racism off” by filtering or blocking others as a user (run from any instance that takes this approach instead of defederating or blocking at an instance level).
If your instance is shit and gets blocked, don’t complain that it got blocked, either complain to the admins of the shit instance or move instances.
Boost the things they say about their experiences or the experiences of others and boost things they care about because likely it’ll benefit people at the very least by raising awareness.