scoff

(noun) showing your contempt by derision. Synonyms: jeer, jeering, mockery, scoffing.

(verb) laugh at with contempt and derision. Synonyms: jeer, flout, barrack, gibe. Example: "The crowd jeered at the speaker."

(verb) treat with contemptuous disregard. Synonyms: flout. Example: "Flout the rules."