They travel on the same trains, we work the same trains. We get to see them again.
I used to see one male regularly on late trains from a certain station. I once had that kind of response from him. For a long time afterwards, I'd look out the window for him as I pulled in to the station, go and unlock where he was standing (usually with security standing behind him as he was known to be a scrote), and then ask to see his ticket before letting him board. He invariably didn't have one, so I would refuse to let him board. "But it's the last train", "You're being racist", "I'm doing you for harrasment", and my favourite, one cold night, "But it's snowing!". Same answer every time "No ticket, no travel" and I'd wave him goodbye as we pulled out. He never got the message, he never had one. (He eventually ended up with a Railway ASBO and jail).
They might win the battle once or twice, but they have to get lucky every time.