I’ve just checked and the bug doesn’t happen using firefox on a desktop machine. I can mute one user, and nobody else gets muted.
And it also looks like muting/unmuting somebody on my phone work, and doesn’t affect everybody. I’ve checked by muting/unmuting on my phone and checking their profile on my desktop.
But every time I mute or unmute somebody on my phone, it makes everybody show up as that state when viewed from my phone. But not from the desktop.
So the bug is just with displaying the “normal” / “muted” setting on my phone, apparently. So maybe muting still works.
Worked example:
I mute craig on my phone, then go to onthebannedwagon’s profile, and he shows as muted too. I check on the desktop computer, and only craig is muted. On my phone I change onthebannedwagon to “normal” (i.e. unmuted) and now craig shows as unmuted too. But on the desktop, craig is still muted (and onthebannedwagon was never really muted anyway, he just showed up that way).
So on my phone, all users show up with the last set muted/normal state I set for any user, even if I set it for a completely unrelated user.