My kid stims and everyone stares

My 3yo flaps hands, spins, makes repetitive sounds—all regulation tools. But in public (grocery store, park, temple), strangers stare. Comments like 'is your child okay?' make my kid feel watched and wrong.

My kid's regulation is being interrupted by society's judgment.

How do you raise an autistic/ADHD child in public without internalizing other people's discomfort?