If someone turns voicechat off or down to 0, it should show a deafened icon next to their username in tab menu and when q is pressed.
I don’t like wasting my breath to people who aren’t even listening to my words of wisdom, especially when I’m trying to teach someone a hole-in-one trickshot on minigolf only to have to retype everything I just said.
Edit: As vtipoman said, also add a deafened icon for people who mute/block you.