Did this couple overreact?

Earlier today I went to McDonald's. There was this boy running around and screaming. He was probably 5. His mom was chasing around, and trying to control him. There was an older couple there. The boy ran up behind them and screamed bloody murder. The old women plugged her ears, and said "some of us have ears!" The old man said something, but I forgot what. I think he called the boy a little shit. The mom was like "don't talk to my son like that. He has autism. The old man was like "I'll say whatever I want to your sone. We're in public" I completely agreed with him, but I stood there silent.

Did this couple overreact?
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