We had a planned trip to Asia, but I don't want some person I hardly know coming with us.
Why would you want them not to come with?
I barely know him and it's uncomfortable. I am really trying to find an excuse to leave him out on the beach.
It make s sense that you do not want to travel with someone you dont even know, especially if this is a vacation for you. Since it is happening regardless it may be a good idea to do your best to get to know the person. Maybe you have more in common with this person than you even realize.
You are not helping here. I really hate this guy.
I get it, you really don't like the guy. But making a big fuss over this could cause issues with everyone else on the trip. I think you should give it a shot and things may change in you might become friends of them after all.