This thread put in mind of an event which shall remain nameless where a family brought their Down Syndrome child and parked him at the dessert table so that they did not have to deal with him. He was happily stuffing himself with sweets when I asked him if he liked music. He lit up.
We left the food and went off to the room where there was singing and musicians. He and I thoroughly enjoyed it. When he knew the lyrics he sang along. Someone sang a slightly risque tune and he laughed and blushed.
If someone is a problem and interferes with others enjoying themselves, they need to be reined in or asked to leave. If someone is "different" and it makes you uncomfortable, don't make eye contact. It is your problem, no one else's.