Because I do, feel bad that is 
This didn't happen today but it's been playing on my mind...
DH and I took the dc out for the day. We were at an indoor place waiting for an event, as we were standing there more people came in behind us. Then I heard a really loud shout and a grunting sound, I turned around because it made me jump and saw a mum with an older boy who was making the noises and could see he had sn. Once I saw him it was clear the noise was because he was excited and so I smiled at him and his mum as I would with any child being cute/excited and thought no more of it
But then my youngest started copying the sounds the boy was making, he's only one, just a baby and he just copies everything at the moment. We were trying to discretely shut him up but it wasnt working
then the doors opened and we were ushered in, I tried to look back to catch the mums eye to make it clear that it was the baby and that no one was trying to ridicule her son, but she'd dropped back so I couldn't speak to her, she gave me a death glare and then I couldn't see her anymore
I was (and am) just so mortified that she or her son might have thought we were making fun of him. I keep wondering if we ruined their day. I feel so guilty and think I should have handled it better. And if you are recognising this and it was you then please accept my sincere apologies