I put a listing for some free stuff on craigslist, but there's a guy who responded who I'm not going to give the stuff to.
Aren't you giving those stuff away in the first place?
I dislike this guy a lot.
It's your stuff and you can decide whom you'd like to give it away to, but why are you being so petty? Who cares who gets your stuff, you're giving it away for free. Just let the guy take the things and be happy to be rid of the clutter.
I'm going to ruin this guys life just because he annoys me.
Just let the guy know that you won't be giving your free stuff to him. That will be the end of that.