I let God handle people like that. I give them to my God Box. This is how I do it: I write down "I give my relationship with ____ to you God, I can't handle it my way, so I give it to you to handle it your way." And then I put it in my box and walk away. 100% of the time it get's handled. He may become fired, or get transferred, or I may have a revelation about what it is that bothered me so much, etc....
My kids are dealing with a friend that is just like that. He is so annoying!! They don't hang with him anyomore, but it is hard when you are an adult and you have to be around them!!