put-down

put-down
ˈput-down noun [countable usually singular]
something you say that is intended to make someone feel stupid or unimportant
   SYN  snub:
    She was tired of his put-downs.

put-downBrE /ˈpʊt daʊn/ 🔊NAmE /ˈpʊt daʊn/ 🔊 noun (informal) a remark or criticism that is intended to make sb look or feel stupid 令人难堪的话；噎人的话