Do exes do this? Why is this dude telling me this?

I'm 19 and girl. I'm a loner and introvert who keeps to herself and stays at home or hangs with my 3 friends. Okay so back in highschool I had more friends etc who I don't talk to but for the past 3 years I stopped associating with everyone from school. Anyway, I had a bad break up with some dude who got mad and left me drunk on a road and we never talked again.

Well this boy starts contacting me, and commenting on FB status and mentioning my ex in them. Even though it had nothing related in the status. (btw i am currently dating another, and very wonderful guy who I love. So i'm I talk to the guy on messenger and he goes out of his way to tell me he is hanging with my old friends (my ex and his bff) and I'm like "That's great for you" and I didn't reply back.

Were they likely just going out of the way to mess with me? My ex is a dick and treated me like crap and left me drunk and let his friend try to assault me. Like seriously screw him. But we haven't talked or associated in months. Is is likely they are just talking smack and messing with me. I know its just facebook but my ex has me blocked so why is this other guy messing with me?