It's a Distributed Annoyance of Specific People (DAoSP) attack. Where are the internet police? 😉
Now I'm curious if this is being done with a use of cloud provider servers...
I got Amethyst to block ReplyGuy pretty well. Go to Security Filters > Hidden Words, and then add:
"GM, from wss://"
"ReplyGuy on wss://"
"xDBupZD.jpeg"
The .jpeg is the avatar they use, which surprisingly Amethyst searches for.