So did I! My whole career, in fact.

My best out of work story was when I went to buy a mini van and asked the salesman the difference between the Plymouth and Dodge models, expecting a technical discussion I got the dodge has stripes

That's really bad! Years ago I wanted to buy an Explorer with a standard transmission and the salesman told me that women don't drive standard transmissions! At that point I'd been driving for 25 years, and had always driven standards. Bought my Explorer elsewhere.