I'm not sure about the other autistics here but being late bothers me. If there's an agreed time then I make sure I'm there no matter what. It bothers me when I don't stick to an agreed time, it is an agreement, a promise.
I'm stood here waiting for the bus. It's almost eight minutes late. I know there could be traffic hold-ups but it still bothers me that the agreed time for its arrival is past and I now could be late for school.
Another time incident happened the other day. My Mum said she would have an evening with me, she'd be in my room at seven. Seven comes and goes. She never came up. The next morning she says she forgot, but I think it was more she didn't want to but said she would to make me happy and feel loved.