I'm trying to buy a new car. I don't have any strong feelings about what particular car I want, just a practical family car for a decent price. It will be very much my car (not DH's) and as a general rule all financial decisions are made jointly, although I am more savvy, so DH will usually go with what I recommend.
We live in a large town and most of the motor brands have a main dealer here. We have been to almost all of them and there is no car I can buy, as they have all, without exception, talked to DH as if I wasn't there. This is despite DH (and I) regularly pointing out that it will be my car, me doing the driving when we take a test drive, me doing the talking when it comes to price and on one occasion DS2 telling the dealer "you do realise Mum's in charge?" 
I can't believe they don't get better training than this. I have worked in sales and the very first thing you're taught is to establish the decision maker. Even if they don't actually believe that I will be the decision maker
it must be clear that I am a strong influencer.
Even in "old fashioned" couples, like my parents, a decision like this would never be made unless my mum was happy with it. How do these people ever sell a car?