Honestly, I don't give a fig about strangers judging how I parent my autistic son. I know I'm doing my best with all three of my kids, and am also constantly learning from my mistakes. Plus Leo has the same right to be in public as anyone, as long as (like anyone) he's not being disruptive. If he's having a hard time, there's always a good reason, and we move on.
What I do care about is how strangers respond when Leo needs accommodation.