There is such thing as a person grabbing their own shovel and digging their own grave
If you've ignored them and they're following you around and posting inflammatory shit, and you keep seeing that "Show ignored content," in the bottom right hand corner, and you're THAT concerned; check it out, if it warrants merrit for a report, report it.
An expert or not, if a voice is large in a conversation, you have to expect ignoring that voice is going to change the dynamics of the conversation for you. Self evaluation there; do I ignore a large voice, listen to a large voice, etc.
Imagine this scenario; you're sitting playing CoD or Halo, beer on the coffee table, talking some shit having a good time
Hey, that dude in the game said something I don't agree with
There's a multitude of ways to handle that, in a way that wouldn't allow people to call YOU an ass hole
If you don't agree with the tone of the conversation, sip your beer, nod, and if they ask, you already know if you're walking on egg shells or not
Plenty of other content to engage with