Perhaps you could give him a couple of smaller portions. I'm not sure if that will solve the problem, it really depends on why he is doing it. Perhaps he feels he has to eat quickly or someone will take his food. I encountered a lady who used to 'shovel' her food in & it would go everywhere, she has Huntingtons Disease. You could try seating him away from those who find it extremely offensive, but not on his own as he will feel excluded from the group.
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You could try seating him away from those who find it extremely offensive, but not on his own as he will feel excluded from the group.