That is horrible Tigriz. Maybe she was from the "children should be seen and not heard" school of thought.
I have gotten that comment about my 7 year old son who is autistic. He does not make any rude noises, does not yell in public (well, not too often), just babbles a bit and talks incoherantly. I have had people tell me "Will you tell him to shut up? Really! Make such noises in public!"
I just tell them "Nope, he has every right to talk. I will, however, tell YOU to shut up. Really! Being so rude to strangers and discriminatory against the disabled!" (not that they are necessarily, but it always makes them mad)