If I'm forced to submit to their company, I will generally just be quiet unless I have something pithy or relevant to say. I smoke a lot, so leaving the room is a good way to buy some sanity.
My patience, thin at the best of times, turns me into someone that just does not give a fuck how his words land. I hurt feelings, which isn't fun or pleasant for anyone and prompts me to just keep my distance more.
I know how mean I can be. Few people deserve that.