OTOH, a customer certainly has a relationship with the car manufacturer, through advertising and mental image.
When you shop for a car you choose the make and model first, then find a dealership that will sell it to you. If you get your media from Amazon, you go to Amazon to see what they have and choose from that. Amazon controls the relationship in a way the dealer does not.
IIRC, this is basically why car dealerships exist and you can't just order a car out of a catalog.
There are many car dealerships. There are only a few car manufacturers. So the latter have forced the former into a bad deal.
Tesla, however, was in the unique position of having enough capital to open their own dealerships, which has caused a lot of friction with more traditional, "family-owned" dealerships.