I don't know, I feel that way, too. I've been through long sales pitches, mall workers, even TV commercials . . . and I'm pretty sure the emotions I feel are not the ones they intend me to feel.
When I hear friendly pleasantries or "This is a special deal just for you" or "I just marked down the price 50%" or "Super exclusive supreme top-of-the-line product" or whatever, I'm supposed to feel . . . I don't know, flattered? Excited by the opportunity? That's not what I feel. What I feel is more like, "Don't insult my intelligence, you jerk." And maybe a little, "Don't pressure me to make a decision with insufficient research. Jerk."
I don't know, I generally like to think the best of people, but every time I've interacted with a salesperson, I've spent the entire conversation with the forceful emotional impression that they were insulting me and trying to take advantage of me. And I never buy anything from them.
But man, when the unwanted upsell starts . . . I politely say no, but I'm sure you'd be able to tell from my demeanor that I feel quite insulted.