Do I expect too much?

[grey]

But in the back of my mind, I always think that people would trust that I know something, or pay more attention to me, or whatever, if I was a guy.

I often think this too. I change my approach depending on the guy, but if it's one that clearly has issues with women, I become a lot more assertive. I make it clear I know a thing or two and lay that out (even if that's the ONLY thing I know) and say it like a flat statement of fact, which it is. Usually at this point, Mr Bonehead will change his approach. Other times, there is no point in dealing with Mr Bonehead. Take your business elsewhere.