It's not that uncommon for car sales people to not know much about the products they're selling. They're hired for their ability to close the deal. I went into a dealership once to look at a vehicle that I'd researched extensively and found that I actually knew a lot more about it than the salesman.
On the other hand there is something to the notion that women get treated differently. The worst I encountered was one who wouldn't even speak to me, and directed all of his comments to my husband, even though I asked the questions and it was made clear that I was buying the car. I imagine he didn't last very long at the job because we just walked out after a frustrating 20 minutes.