you referred to the caller as a sales punk before he uttered the phrase, exposing your attitude. Just because you are biased against sales people and also have a thin skin when it comes to the slightest challenge in a question does not mean that the product would not be beneficial and worth it to you if you had a more open mind, nor does it mean that the sales technique on average is a failure.

i.e. when I read your comment it struck me as much more revealing about you than about the salesman, his technique, or his product.