I've decided that I'm not going to invite my friend to hang out anymore.
Why don't you want to hang out with your friend anymore?
I really don't want to spend time with him
Well you don't always have to spend time with him, just once a while should suffice but I don't think you should purposefully exclude him just because you think he is boring. He would probably be very hurt knowing how you feel about him and the friendship might fall apart.
I don't care. He is an annoying asshole who gives me bad vibes.
It sounds to me that you have grown apart from your friend and I think ending it and moving on might be the best solution for the two of you. Some people aren't meant to be friends forever and if you don't get good vibes then just end it.