Around here, a Jetta is considered a cool car.
You can't let another person's opinion affect your thoughts and feelings about yourself. Realize that she may be acting exactly the way she was culturally conditioned to be. It's pretty hard to change that, unless you make a conscious deliberate effort to. Set your boundaries so you only interact with her when *you* want to. She's probably not going to change... I know it sounds mean, but your own mental health is at stake. If it wasn't your mother, I'd say don't see her. Of course, that is an option, but most people don't want to do that.
This isn't just my professional advice. It's personal, too. I've cut ties with all my negative relatives. Not my parents, who are blessedly level headed, but the ones who live near me and expect me to be exactly like them.
That's never going to happen!