(a.) Expressing, serving for, or characterized by, derision.

abusive arrogant audacious aweless back-biting bantering belittling biggety bitchy blackening blameful bluff bold booing brash brassy brazen bumptious calumniatory calumnious catcalling catty censorious chaffing challenging cheeky chutzpadik cocky condemnatory contemptuous contumelious crusty damnatory daring defamatory defiant defying denunciatory deprecative deprecatory depreciative depreciatory derisory derogative derogatory detractory discourteous disdainful disparaging disregardful disrespectful execrating execrative execratory facy fleering flip flippant fooling fresh gally gratuitous greatly daring grinning hissing hooting impertinent impudent insolent invective inveighing irreverent jeering joshing judgmental kidding leering libelous malapert minimizing mocking nervy objurgatory panning pejorative pert priggish quizzical ragging railing rallying razzing regardless of consequences reproachful reprobative reviling ridiculing roasting rude sassy saucy scandalous scoffing scurrile scurrilous slanderous slighting smart smart-alecky smart-ass smirking sneering snickering snorting taunting teasing twitting uncalled-for vilifying vituperative wise-ass