Hey Brit Haven't posted to you in a while I apologize for that. I can tell that the sports car is especial to him. It's probably a big part of his post divorce identity. Every guy has to have a trademark item right? To him it's his car. I'm sure it feels silly or materialistic to you, but to him it's clearly a status symbol to signal to other men his and women his worth.
What's your best physical feature? Legs, eyes, waist? What if your H got upset at you for being proud of it? What if another man rightly complimented you for it? Would he get points with you while your critical H lost them?
Now consider this, whether they are interested sexually in your husband or not, a nice car will turn heads. Your H knows this, his comments prove it. So why not give him that attention he craves? You know so he doesn't get it somewhere else....
I think you did the right thing. Your husband stood up for you. In caveman days that means that he potentially risked getting a club to the head for you. A very alpha move indeed. A woman's appreciation IMHO is like crack to a man we crave it. On the other hand a woman who does not appreciate it when we stick up for them, well that's like repellent (again IMHO).
Just some thoughts based on your last post, I'll try to catch up so I don't speak out of context.