Did you ask her if that's why she stopped riding with you?

It seems to me that she was being fairly blunt and (though nobody agrees with her admission), honest. Yes, she is wrong. For the fact she admitted it either means she doesn't realize it's wrong, or she doesn't care.

I think just about everybody has some kind of prejudice. It doesn't make it ok or good but identifying the prejudice is a larger step than most people are willing to make.

A lot of people here bash certain political parties. Or political viewpoints. (Yes, speaks me the conservative republican ) For those people I've opened up to, oddly enough we share (yeah, even the more liberal people) almost the exact same viewpoints. This might not be the same as judging someone by their skin color but blind disdain for a group without looking at people as individuals is wrong. We all do it, however.

So, I would just talk to her. Hashing it out here does nothing and doesn't change her opinion or help your hurt, really. It's not your job to make her "see the light" but who knows, it might open her eyes to something she didn't realize.

Dunno. Could be I'm getting cranky but everyone has preconceived notions about something. It's all on whether we admit them and what we do with them. She's halfway there.