Maybe exercise the company expense card and start having dinners / drinks with these folks. They might be less assholish if you wine and dine them a little. Normally, I would say fire them but from the sounds of it you are too far gone. Drinks, breaking bread, and having a few laughs might smooth things over. At the very lease you can eat out at some fancy places and tell the folks at work you are smoothing things over. This could be tough if you hate them though.