Teach your child some responses to have in his back pocket. When people laugh at my stutter, I respond in the straightest face possible “I have a stutter.” And then go silent. Let them sit in their embarrassment longggggg enough. Bonus if it’s said in the presence of others, they panic REAL quick and learn their lesson. I’m not a fan of the ideology that ‘it happens, move on with it’ Sure, it happens - but if we can enlighten someone on why it’s not cool to behave like that, you’re saving someone else the pain down the road. I am 30 and still have people make fun of me. Most often I get “did you forget your name?” 🙃