What dorisdog says.
I'm a teacher and I try to install in both my class and my own children the importance of manners and standard behaviour. On a recent class trip I laid very strict ground rules about behaviour in the theatre which several decided to forget. So they spent the rest of the trip by me. They lost play the next day.
However, I'm also acutely aware that when a child has additional needs it can be different. On the same trip was an asd child whose mum accompanied them. It was enormously helpful.
I know this because my ds is currently in the process of being diagnosed with asd. His doctor, family worker, teacher and school nurse all agree. Just waiting on the second peadeatrician. I was that parent over the half term. A trip to a hotel for a weekend away was going pretty well until we couldn't get the same table for dinner as we'd had for breakfast because someone else was on it.
Ds started being resistant and refused to move and was heading for a big shouty explosion. Everyone was looking, wondering why a big nine year old was going mad. Tutting. Dd started moaning. I felt like a terrible parent.
Then the gorgeous lovely waitress pointed out the table opposite was symmetrical and the same. I could have kissed her. She was superb, had a younger brother with asd and had noticed that ds was knuckle cracking. She was brilliant with him and saved the evening. Without her I would have had to leave.
It's not always kids being bad. Just be kind and take a second look before you judge.
(I wrote to the hotel commending the waitress. And left a large tip!)