Word for a sound of insult-with-a-smile

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"

Wiktionary lists several words as “representation of the dental click used to show disapproval”:

• tch, “a representation of the dental click used to show disapproval; tut”
• tut, “tut tut; an expression of disapproval”
• tut tut, “An exclamation of disapproval”, with pronunciation note “IPA: /ǀ ǀ/ (dental clicks). Often the spelling pronunciation IPA: /ˈtʌt ˈtʌt/”
• tsk tsk, “An exclamation of disapproval”, with pronunciation note “IPA: /ǀ ǀ/ (dental clicks). Often the spelling pronunciation IPA: /ˈtɪsk ˈtɪsk/ or IPA: /təsk təsk/”