A taunt is a sarcastic remark, challenge, or insult intended to provoke a response of some kind from the one it is directed at. It can be compared to fighting words and trash-talk.
verb (used with object) 1. to reproach in a sarcastic, insulting, or jeering manner; mock. 2. to provoke by taunts; twit. –noun . 3. an insulting gibe or sarcasm; scornful ...