Went on a road trip for a long weekend when I was just out of college with my long time friend and a friend of hers from work. About midway through the first day the friend from work decided she didn't like where we were going to (my long time friend's old college), didn't like where we were staying, didn't like the plans that had been made and frankly didn't like us. She wouldn't talk to us (just sat in the back sit reading her bible), wouldn't eat with us, when we were in the hotel room she was down in the lobby. She came up one evening when we were still awake and left quickly. We kept asking her what was wrong but she just would say nothing or deny a problem.
Finally on the trip home, after I got dropped off she told my friend that she was very angry at her because she didn't introduce me properly to her and there for she couldn't be comfortable with me. I guess it wasn't formal enough to simply say, "this is Nancy, I"ve known her for years." ?
We still had fun but it was very odd to have this person with you who so clearly hated the fact she was with you. Just as a follow up to the story, about 3 days back at the office, my girlfriend was sitting at her desk when this other woman came up behind, dumbed a pop on her head and screamed at her "are you happy!!!! I can't work here because I can't stand the sight of you." and quit that day.
There are some odd people in this world.