Not usually my favourite people, the ticket inspector I bumped into on the train this morning was a legend. He was super-polite. Happily wished everyone a good morning, apologised for the inconvenience and then went about his job. Gave most people a respectful "Hello, how are you doing sir/madam?" as he checked their tickets.
When he found an offender he handled it discreetly lowering his voice so as not to make a scene nor embarrass the person.
Sure it helped that he was about 6’3" and built like a tank – no-one was going to argue with him however he handled the situation. But kudos to him for doing his job politely and respectfully.