I'm going to blow off my neighbor
Why do you think that you are going to just blow him off?
I just do not feel like hanging out with them.
You shouldn't just blow him off. If you made plans you should always try to follow through.
I'm just not feeling it. If they wants to be a bore, I'll let them.
I think that you should at least tell them that you do not want to hang out anymore. It is rude to make plans with someone and then just not show up.