My two cents...
Usually when a salesman tries a pitch it irritates me. Even if he educates about a product or service it still irritates me. When the salesman continues and continues to try to sell his product X and (as others have indicated) that salesman arrogantly states X product is so much better than Y and Z product my irritation grows into anger. At that point, as far as I am concerned, I will tune out the salesman and tell others that he is JUST WANTING to MAKE MONEY! Is that not what he does?!?