My 2c: while I don’t think I have enough context and history to really know, since you said rage I’d suggest trying to reflect on all this. Rage can be unhealthy (literally) and in a way it could be that you’re allowing this person to have a negative effect on yourself. It’s great that you care about your work and its success, but ask yourself whether you need to care this deeply about someone else’s work even if it impacts your own. I’d ask whether you could achieve the same result (reporting their behavior up to recommending they be fired) in a more calm, purpose-driven manner.

Tried it and nothing, double checked the manual for my model and looks like this one just doesn’t have a mute or volume down function. Ah well, eventually it’ll break and I can fix it then!