impossible

It turns out to be ridiculously, impossibly hard to buy a car. I know what car I want. I know how much I'm wiling to pay for it. And you know what I get, after extensive research, when I tell a car dealership that? 

Last night, one of them told me that I am wrong. 

Let that sink in for a moment: this guy claims to want my business. He tells me that he can get the car I want. He called me, so he apparently does want my business. And when I told him, based on my research, that one aspect of his pricing (a delivery charge) was more than I wanted to spend, he didn't say, "Let me see what I can do," he said, "No, you are wrong." 

Then he proceeded to mansplain to me 1. why buying a used car is a bad idea (he also sells used cars), 2. why Mazdas are just as good as Hondas and Toyotas (which is nonsense and unnecessary, since I told him I wanted to buy a Mazda for the manual transmission EVEN THOUGH they aren't as reliable as Hondas and Toyotas), 3. why he doesn't pressure people into anything because he wants people to send other people to buy from him (while continually telling me that I had no choice but to pay his delivery fee or end up with a lemon). 

I really don't understand how car dealerships do any business. So far, I have had the following experiences:

1. A car dealership that won't come down to reasonable prices. Should a used car really cost the same as a new one?
2. A car dealership that added all sorts of hidden costs and turned out not to have the title anyway. They also wanted me to sign a paper with my offer on it. I get the psychology that they think it makes me more committed, but it just made me irritated that they thought I was that easily manipulated.
3. A car dealership that claims to be able to get the car I want, but insists on telling me that I am wrong about everything. This bullying does not make for a happy customer. 
4. A car dealership that does not, despite confirming in writing, actually have the car I asked to see. They tried to sell me on some other cars until I flatly told them not to contact me again unless they had a manual transmission in stock. 

How is it that every other business at least attempts to offer what people want at a price people will pay except this one? 

If I were a man, I would have my car by now.