Learn English – Word for a sound of insult-with-a-smile

expressionssingle-word-requestssounds

What is that sound called, when one produces a short demeaning (almost as if looking down upon the other person) sound, which might be followed by a very cunning smile.

Example:

A: The US is pressurizing Iran on genuine grounds. It has no horses of its own in that race.

B: That Sound, Are you really that dumb?

Best Answer

Alice: "The US has no horses of its own in that race".
Bill: (snorts) "Are you really that dumb?".

...where Google defines snort as...

an explosive sound made by the sudden forcing of breath through one's nose, used to express indignation, derision, or incredulity.
"he gave a snort of disgust"