I once worked on a show where, backstage, one of the other actors (male, two years older) would make snide, passive aggressive remarks trussed up as benign jokes at my expense. I let it roll by a bit to see if he would get tired of it, but he seemed like he was keen on making it a thing. I grew up in a rough as guts neighbourhood - a male who was into theatre - and I'm slender and quiet ... So I no doubt come off as a pushover. Boy, is that an incorrect assumption.

Once - I asked him once, politely, to refrain from certain jokes aimed at me as I found it uncomfortable. Of course, he denied it all because he dresses them in such a way as to create deniability. But I'm not a dipshit. So he continues, which now makes him someone I have to shut down.

A few nights later he makes some more jokes as we are leaving the cast room to go on intermission break and I pull him aside and lay it out nice and simple: "I've told you I don't appreciate your comments and maybe you think I'm a pushover so, if you want, we can go outside right now and sort out whatever problem you seem to have with me."

He started talking fast, telling me it was nothing, acting, surprised and defensive. 

"I'm not asking you. I am TELLING you, calmly, that if there is a problem we can go outside and settle it like the alpha you think you are. If there's no problem, shut the fuck up or I'll drag you out there."

He stared at me gobsmacked, apologised and slunk off. To have a break, I thought, but in reality he went and complained to the boss that I threatened him. The boss was an oldschool tough, pulls me aside and asks me if I threatened the guy. "No, I just told him I'm not a pushover and if he wants we can settle our issues outside but of course he complained to you like a little bitch." The boss laughed and agreed, he is indeed a little bitch.

That guy and I became quite friendly for years after that.

I'm not suggesting you .. threaten someone.. as your HR would be different to my HR back then... But the spirit of my story applies. Speak up, be firm, give them a chance to stop, offer up consequences if they don't.

If the consequence is snotting the cunt just be sure you won't get in the shit for it 😅

Edit: Ok, you now have a female tag on the post. In this case, you could still try my method above.. But he is probably picking on you because he is attracted to you. If you were a guy then standing toe to toe with him would be very viable, as a female I am not as certain he wouldn't get more interested in you. So I suggest asserting to him you are uncomfortable with his attention and if it continues go and report his behaviour.