Salesmen aren't looking to understand what you want beyond knowing what might match up to what they have to offer. If they have a showroom full of cars with touch screens, then they'll act like it doesn't make sense to not want a touch screen because agreeing with you implies agreeing that you should look elsewhere.
There are some salesmen that are good about this and don't want to waste your time or theirs, but car salesmen have a certain reputation for a reason.