How should I best handle this situation?

I’ve joined a social group for people with Autism and a guy I’ll call *Brian* keeps trying to pursue me. He’s a lot more severe and less intelligent than I am. He keeps trying to get me to unblock him on Facebook and WhatsApp and has started talking about leaving work early to catch the bus to my suburb, so we can hang out before a group activity.

It’d be easy to sort him out if we weren’t part of the same community and weren’t going to come across each other a few times a month. He’s booked every group activity for a year in advance and keeps trying to wear me down. I’d forgotten what a mistake it is to be friendly and polite to guys in my community. How should I handle this? I think he’s a good guy, but I only want to be casual friends/acquaintances.

How should I best handle this situation?
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