Five years ago, I did a 1 year vocational course at uni where I met a male friend. We were never particularly close - he used to tag on to the group of friends I regularly socialised with sometimes and I was always friendly to him but that's it.
When the course ended, he kept in touch on Facebook which I didn't think anything of because I'm still in contact with lots of people from that course. However, last year his messages started getting inappropriate (him making suggestions that he's always liked me in a romantic way, we should be a couple etc.)
I explained in a nice way that I don't see him in that way and he seemed to accept it. I would rather be honest as I'd never want to lead someone on. We just dont have much in common and there's no physical attraction.
Last night, he contacted me after a year and says he's been working abroad and we should meet up. I found this odd as we haven't met up in 5 years, since the course ended. He started making inappropriate comments about my appearance and I asked him to stop.
He then sent a message saying 'I was being sarcastic. You've made it clear on several occasions that you think you're out of my league.' 
I was quite upset about this as he's basically accusing me of being stuck up and arrogant when I'm the total opposite. Evert time I speak to him, he makes me feel like I've done something wrong because I don't respond in the way he wants me to.
Should I block him on Facebook so he can't contact me again or am I over reacting? I'm just sick of him making me feel like I'm doing something wrong when all I see him as is a distant friend I knew at uni.