I have found rude people in Case, JD and Kubota dealerships. Have found sales people in other dealerships who were not great but ok. Best dealership I have ever found was a Yanmar and really wanted to do business with them but was concerned about the lack of any other dealership within 100 miles and they were a reasonably new dealership, just over a year.
Not make excuses for any but they seem to have hard time with a potential customer just showing up on their lot. I can understand this as I also work in sales but insurance. In my business we work 99% by appointment. Now we take questions all the time over the phone but not very seldom are we able to handle a sale without it being an appointment.
But, being rude, lying or such is never proper.
It is not one industry, it is the attitude often we find in our country in the last few years. Too many people only want the pay check, not the job.