Actually, are you aware that ADHD can override anything, including manners?
My DC has beautiful manners and when on her ADHD medication, is the model of a polite little English girl. Awards from school, comments from strangers on how polite she is. Even a commendation for helping others. Please, thank you, may I, is it possible etc etc.
Without medication? A human jumping bean and noise machine. interrupts. Inappropriate comments. Needs to be held tightly by one hand despite her age or she's out of control. She has no impulse control and has no sense of risk so is in danger in some environments.
The medicated and unmedicated behaviours are night and day. Yet we've had public comments, constant, ongoing reports from school, side-eye looks from other parents. She literally can't help it but as far as other adults are concerned, she's a rude, aggressive brat.
I reiterate. An observer can't tell the difference.