Sometimes people make voices that trigger my misophonia. Usually it's very high, squeeky voices, they almost hurt my ears & I get very annoyed.

From time to time my friends will make these god awful sounds & I just straight out ask them to please tone it down because the pitch simply triggers me. Like seriously, sometimes it's so bad I have to cover my ears.

I get it that you don't have the exact same reaction, but if it's really uncomfortable to you & triggers you in an annoying way, then you simply have to ask him to tone it down. Let him know that this pitch doesn't work for you, especially not if he keeps doing it 24/7. You should be able to have these kind of conversations with people you like.