Ok, this thread is much ado about nothing but it is entertaining. So what if you had some "conflict" in McDonald's. Get over it.
My child (when he was 7 and is on the Autism Spectrum) literally went up to another table at Downtown Disney and TOUCHED someone else's food.

We knew he had a tendency to want to do this so we watched him like a hawk in restaurants and around others' food, but this one time, we missed it and he made contact with these people's food.
We apologized profusely and offered to buy everyone at their table new dinners. We were so embarrased and felt so bad.
The people's response? "We're from India and a lot worse things have happened to our food than a child touching it." They laughed and wouldn't let us buy them any food or reimburse them for their existing meal.
I learned a lesson from these people. Yeah, it might've been gross, but in the larger scheme of things, so what. Move on.
The child misbehaved, the old lady was a little rude. Get over it.