Drunken Regrets

So I went to a Rugby game last night and met this guy in the box next to us. We had some drinks and were talking and all while he was rubbing my back and hinting at hooking up with me 🙈 We ended up hooking up and it wasn't the best, was really awkward with everyone around and he wasn't the greatest kisser 😕 We started messaging each other and he asked for my surname because he thinks he recognizes me (but I just know he is going to FB stalk me) and I don't want to give to him. I'm not that into him as he isn't really my type and I think the only reason I got with him was because I had a bit too much to drink and it's been a while since I've got some action. How do I tell him that I'm not interested? 🙈