So the mute function is grayed out.
Also reporting the person doesn't mute them this has been broken for a very long time.
I'll post a video showing it soon.
https://youtu.be/FduxmUInoRU So I report him. U can see the mute is blacked out.
And at end of video you see him posting again.
Comments
You can, however, turn off/on zone chat in your settings. I've had to do that at times in public areas when people start unnecessary arguments that I don't really need or want to see.