Oh, he has me muted. Ironic. 
Discussion
On amethyst I don't think you can see who has you muted. I wonder if there is a way to reference the "muted list" as a way of self reflection. Maybe they are bots(not sure why they would bother), maybe their racist/bigot or other type person, or maybe a they just find the person annoying.
In case you don't know, Firefox with nos2x-fox is also available on Android for use with web clients like nostrudel where I got that screenshot 🤙
You can see muted lists on Nostrudel. I muted that guy because he was annoying and being a douche. A lot of people also have him muted as you can see on his list 😂