So there's this guy, let's call him Water Creep because honestly I don't know shit about him except:

1. It's part of his regular routine to go into a local coffee chain store, order just a water, and thank the "pretty lady" or "beautiful woman" behind the counter, multiple times. Not "thank you" but specifically "thank you pretty darling/gorgeous babe/lovely honey". Sonetimes he "accidentally" brushes her hand/arm as he grabs the cup. Squick. If it's a guy at the counter he just grabs it and leaves without a word.

2. His physical appearance.

No name, no nothing else.

I used to be an employee of said coffee shop and my coworkers warned me about WC. They said just slap his water on the counter as soon as he walks in and find something to do in the back, don't make eye contact and don't talk to him. He never did anything particularly threatening while I was there, just creepy. I never even talked to him.

Well, I quit that place a few months back and had no more contact with WC again until today.

I was riding mass transit when I saw him get on the same vehicle. He sat directly across from me and stared at me most of the time. He got up, made a big show of putting his jacket on, looking over his shoulder at me, and paced up and down the aisle a few times before we got to his stop. I didn't stare, I didn't even acknowledge that he existed. At his stop, he turned to me and said, "It's not a crime!" before getting off and staring at me angrily through the window as the vehicle rolled off.

TwoX, I don't know what to do. He's never done anything illegal, just made me (and my ex coworkers) very uncomfortable. I don't like it and don't want to run into him again, especially after today, but chances are good that I will. And the event today... He remembers me, months after I quit, and he's sour about how I didn't pay attention then or now. I'm terrified he's going to follow me home or worse.

Any advice?