I have had family ask me ‘would you rather I didn’t breathe?’ in a rhetorical sense and sometimes I have to stop myself from saying ‘yes’.
I think its important to emphasise that it is not the sound that
make as such, it’s just sounds in general, we all make them (even though i’m convinced I don’t make any sounds whilst i’m eating as I am perfect in that regard compared to everyone else who makes disgusting noises). If you were sat opposite the 94 year old woman down the road and she started eating a crunchy apple, you would also wish to punch her.
Also, don’t mention this over dinner. He may slurp when you come to a pivotal moment.
Education is the key.