Do not respond, do not engage, block. It is amazing how tgese disgusting trolls lose interest when they get zero reaction.

Block them and move on.

Report and hide user to start. Report for your friend (follows are important here) Most client apps hide messages, notifications, etc with 5+ reports from follows. If they fail, let them know. Relays will delete msgs if reports are valid. You can stop using the relay of the attacker if relay oper...

I think a friends-only mode or private-relay-only mode is more effective if you never want to be exposed to vile stuff on the internet.