To hum and haw means to speak in an evasive, vague, roundabout way, which is what the other merchants would do if asked.
Context: If you ask any other merchant, he will talk in a circuitous and evasive manner, then make fun of your appearance, then refuse to deal with you.
Hypothesis: Ask any other merchant, and he will hum and haw , then make fun of your appearance, then refuse to deal with you.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?