What it takes to offend someone is a good indicator of whether or not I want anything to do with that someone. Some people take my sarcasm and semi-arrogance in the joking way I intend it, others take offense at the slightest little thing. I have no time to waste assuring soft, sensitive people I didn't mean to hurt their little feelings.
I don't worry about hurting feelings either. But sometimes the situation dictates that you check your audiences. haha