There are a some lies from salespeople, but you'd really be surprised at the lies from customers!
The old saying is "Salesmen lie, customers negotiate."
Most salespeople are honest hard working folks trying to feed their families, just like any other job, but the bad ones are really bad and
the good ones you never hear about. Kind of like cops, the news seldom talks about the 1000's of arrests that happen everyday without incident, only the ones that go bad.
As an industry, especially in the 50'-90's we did ourselves a lot of damage by allowing customers to be treated badly. Most of those guys are long gone, but a few of them and that attitude is still hanging around.
But, people still buy from them, so they must like that style of treatment.