Not excusing the OP's experience with a salesman at all but if some of the people spent a day in the salesmans shoes they'd understand a bit more why so many don't seem to give a ****; high staff turnover, demanding customers, pressuring management etc etc not to mention those complete time wasters who spend hours tyre-kicking and test driving then go away and order online.
I wouldn't have thought that there was anything unique there. We all have travails (or travaux, if you're French).
I've been to a couple of other brand dealerships recently.
My usual M.O. is to look at several marques and models that interest me, decide which I want and then look around/wait for the ideal used to appear. I always buy from main dealers.
At BMW I was looking at a specific used car and they couldn't have been more helpful.
At the first Audi dealership I was told that the model I wanted to test was out with a customer, and someone would call me tomorrow to arrange a test drive. No one did, so I struck off that dealership for any future dealings (the word 'dealership' is becoming a misnomer these days it seems).
The second Audi dealership showed only slightly more interest although the 'salesman' seemed to be more interested in resuming his post leaning on the reception desk chatting-up the receptionists. He politely declined a test drive as there was no specific car that I was interested in, and as he didn't put much effort into showing me the model (car not receptionist), though he did give me the freedom to sit in one and press some buttons, I struck him off the list too.
If I had been a salesman under those circumstances, especially with nothing else to do, I would have had at least two things going through my mind, (1) communicating with a potential customer, or tyre-kicker, would help make home-time seem to come around quicker, (2) the time spent in such a way just could be an investment for the future, i.e. if I show an interest, maybe he'll come back here when he decides what he wants. Whether or not a sale results, what has the 'salesman' lost?
I have yet to try Jaguar. My dealings with them over my ten years of Jaguar ownership was always good. That may or may not still be the case.
A lot of them are totally devoid of interpersonal skills and only want to deal with things that fall into their lap.