When into town on the train the other day. Gent sat next to me puts his empty coffee cup down. I really dislike littering. But train's a bit crowded so I think "it's ok. he'll put it in the litter when he gets to his stop". Train pulls in at the terminal and he makes to walk off. I tell him he's left his coffee cup on the floor. His response is that he's left his cup there because people leave their newspapers on the train. I point out to him that
a) nobody in our vicinity read the newspaper. That's one thing you can thank smartphones for, and...
b) just because others did it, doesn't mean it's ok for him to do it.
He says "you're right" and walks off through the barriers. At this point I realise there's no point trying to reason with pricks.
Now this guy was fairly old and looked well off. Briefcase, corduroy trousers, maybe in his late 50s, early 60s. Shouldn't that age group know better, or am I misinformed?
Anyway, lesson learned. The best way to get angry is to expect something of someone who's not capable of it.