I do not have misphonia but grew up with DM and DSis who have 'hollow heads' so thought I was pretty much inured to noisy eaters. Then I met BIL.
Sunday lunch and we'd all be seated as MIL passed round plates with meat to us, help yourself to veg. BIL would grab most of the roasties, his 'special' gravy and whatever else he fancied, would.mush it all together then, using knife and fork as flippers, would flick food towards his mouth, chomping, chasing it down to his plate, mouth open, chewing all the time.
He would often hold his plate out for more meat before MIL had even sat down for her own.
He always took the last roastie, even if someone else hadn't had any.
Nobody in the family ever said anything.
So I started helping set the table and moved the roasties up my end of the table and handing out the meat plates, BIL got his last, after I plated up some for me and MIL.
He used to shout at me, but everyone used to just laugh and talk over him.
That was 36 years ago, we have been nigh on no contact for 20 years and I can still remember the sight and sound of it, like it is happening right now.
My dog eats with less noise and mess!