Was I wrong?

Yesterday I went out to dinner to my husbands restaurant (him and his brother own it) I was with my 5 year old and he's a quiet little boy, while he was drinking his juice almost slipped and fell out his hand he let out a little scream nothing too loud. Just as that happened an old man behind us turned around furious and said "can he not be screaming while I eat" I got up and said "no, he will not stop screaming and if you don't like it you can get up and move" now my question is do you think I was wrong to say that to him?