I've been to lots of dealers like that.
Once, I was looking for a Camaro Z28 or SS a couple years after they went out of production. Went to a Chevy dealer that had two and tried to get them to let me take a look. First response I got was "Yeah sure, why not, I work on commission here, I'm only starvin'." Uh, alright Sunshine. Just get the damn keys. He walks me over to them, huffing and puffing the whole way. He says "Get in."
I tell him I think the security alarm is still active, he says it isn't. Uh, alright. I open the door and what do you know, it goes off. So he grabs me by the shoulder and yanks me backward away from the car so that I almost fall over as he's trying to shut the alarm off. Now I'm pissed, but it was actually kind of hard to find a decent late model V8 F-body in my area at the time, so I just get in. I'm sitting in it for about 30 seconds before I get irritated enough by his sighing and grunting, so I get up and leave with a "Thanks buddy." He mumbles "Yeah whatever."
Same owner, but at the Dodge dealership. Usually when somebody is getting a car they want me to come along. My parents went to look at the Magnums a couple years ago and asked me to come with them the next time I was in town. The sales girl there brings us all straight to an SRT-8 and proceeds to tell us that it's exactly the same car as the Dodge Viper, just more convenient because it has a station wagon body. I'm not as good at holding in my laughter as my father. "Same engine, same chassis, same everything."
The only dealership I find that doesn't ever resort to any slimeball tactics is Leith Chrysler/Jeep. My parents bought a Cirrus there when it opened in the mid 90s. They got a Grand Cherokee a few years later. I bought my Wrangler somewhere else, but it has been there for service. After leaving the Dodge dealership and their mythical Viper station wagon they bought a Commander. For anyone in the area, they get a very good recommendation. Take it from someone who's been to nearly every dealership within a day's drive. A bad dealership wouldn't necessarily discourage me from getting a car I really wanted, we still got a Chevy.
Not necessarily bad experiences, but back when I was still looking for a Camaro I went to a couple small-time used car lots. The first had a green '96 or '97 Z28, dusty as hell though. The place didn't look like it had much business. When me and my brother in law pulled up, the only guy on the lot ran inside. Probably why they didn't get much business. It had some rickety door and when I tried to get the thing open, it probably sounded like I was gonna bring the whole building down on us. For whatever reason, the guy didn't want to talk.
The other dealership was named something like "Honest _____'s Used Cars" and the guy had a cowboy hats and big cowboy boots. I got a real kick out of that (no pun intended). I spotted a black late-model Trans Am. He saw me poking around near it, so he launched into the whole stereotypical used-car salesman pitch. The car looked a little beat, and I saw holes where a roll cage had once been. I asked him if the car had been modified and he said it wasn't. I passed on the car. It might not have been raced or tracked, but it sure looked worn for a 3 year old car. Neither of those places were particularly sleazy, just weird and amusing.