And if not, what do you do when they come around?

Tim has got this one friend that I don't like for several reasons, but I won't get into those (unless someone wants to know), and so I have resolved to leaving the house or asking Tim to take his buddy elsewhere, because my personal distaste for him. I am in no way asking him to stop being friends with him, I just don't care to associate with him anymore. Tim doesn't want me to leave every time this guy shows up (not like he would out of the blue cuz he lives and works an hour away).