He didn't like how he was treated at a BMW dealership so he went across the road to a Mercedes dealership and bought a car.You said you were ignored at the BMW dealer so you went to the Mercedes dealer over the road.
Because you were ignored did you then buy a lesser product?
How does that translate to him throwing his toys out the pram or buying a lesser product?
Each to their own, some people want to walk in, buy said item and walk out. In this scenario that wasn't an option, so he went elsewhere. Had he made a huge fuss, that would be a different story.