给脸不要脸

給臉不要臉
gěiliǎnbùyàoliǎn
(coll.) to respond with arrogance or disrespect when shown courtesy; to abuse sb's goodwill

CEDICT

colloquial

Entry Composition

1 给脸 gěiliǎn (coll.) to show respect; to give face (esp. in public to avoid embarrassment); (often sarcastic) to treat with basic courtesy (implying the recipient is undeserving)
2 不要脸 bùyàoliǎn to have no sense of shame; shameless