I think we're actually hitting up against a big problem here, which could quickly devolve into conspiracy theories, and while caveat emptor is always a great principal, a vehicle purchase is a big deal, and a salesperson needs to justify their existence and provide value not only to the dealership (by screwing over the customer as much as possible), but to the customer as well, and they can do this by being knowledgeable about the products they sell so the client can get the product for THEM. If the "value to the customer" test is applied to the original poster's experience, the dealership failed, and few of us ought to be surprised. So why did it happen?
This is where the conspiracy theories could come in, BUT seeing as we're throwing around Latin and philosophy, let's talk about Occam's razor.
These guys sell bajillions of gas powered cars, and some have been doing it forever. Literally, forever. Never sold an electric car, only gas. The Bolt has been out for...6 months now? That's very short compared to forever. It also seems that salesperson turnover at car dealerships can be fairly high, so there's a huge pool of people who know zero about EVs but want to try selling cars out there circulating through dealerships. And 99% of their work is in selling gas cars. As a dealer, why would I bother training a guy who's going to work for me for 3 months about 1% of my business?
And naturally, a customer looks to a salesperson to be the one that's knowledgeable about the vehicle. That's their job, right? And the salesperson wants to appear to be competent so they can make their sales. Up until a few years ago, a car was a car, just put the person in and slap'em in the ass and watch them ride off into the sunset. Gas vs. diesel might be a discussion in a few cases - far more than gas vs electric ever was or currently is, but that's IT. A car was a car, you gas it up, you change the oil, you rotate the tires. Fundamentally all the same, and it's STILL fundamentally the same, 99% of the time anyway. The problem is, when it's not the same, there's a chance that somebody's going to get burned. And what's worse, often the salesperson just makes some shit up. I had a guy tell me the Bolt had manual seats because power seats took too much power. He had never driven an EV, but he was supposedly selling them. I still bought the car, but If some kid can make up stories about something as dumb as the power seats, expect ZERO in the way of knowledge about charging and EV specific features. ZERO. This is not their fault, but there might be ways to make things better.
FOR example, if GM is serious about selling the Bolt (and California is keeping it's clean air waiver BTW, so they still need to be serious) then I might suggest requiring that at least ONE person at each dealership take a class and get some kind of certification in EVs, and they and the salesperson get to talk to sit down with each customer for 10 minutes before the purchase is made so some quality Q+A can be had. Alternatively, maybe GM requires that a salesperson needs to complete a course before they can sell an EV. Imagine a customer comes in and wants a Bolt, but Timmy has to hand the sale off to Omar because Omar is EV certified. Timmy gets squat and is sad, Omar gets the sale, and the next day Timmy goes and does the online course and gets his certificate. Now Omar AND Timmy know ANYTHING about EVs, and can be sure that people who should be in a gas car ARE in a gas car, and those that an EV works for know about that option. Makes sense, right?
Barring that, we just leave it up to the Tesla salespeople to do their job, and they get the CO2 credits, which GM can buy FROM them.
Just my thoughts...