As a former dealer:
We have to understand that the initial conversation between POTENTIAL customers and POTENTIAL dealers is an "interview" process that involves two parties, analzing the prospects of a positive outcome for each Both have the option to proceed or terminate the relationship based on the information they are given. The dealer may get indicators that the prospects for success are very low (say, 20%) based on past experiences, and decide to tactfully withdraw at that point.
The key word here is "tactfully" withdraw. In my view, "preserving the relationship" was always the top priority, unless of course, I felt the person was a low integrity individual. I don’t know what kind of day/week/year/life the dealer was having. It would have good to get to know you face-to-face to discuss the turntable. I’m pretty sure your lifetime Hi-fi ambitions are not going to stop with your current turntable purchase.
By the way, I was in the market for a luxury sports sedan a few years ago. I asked the salesman: "If I pick the sports suspension option, how much lower does the vehicle sit?" To which the salesman replied: "I need to make sure you’re serious about the car before I spend the time doing all this research." I ended up purchasing the car (with sports suspension) from a salesman who was a performance driving instructor who, during the test drive, made sure I hit the apex at speed on the exit ramps. Relationships matter.