Zài péngyou miànqián bèi pīpíng, tā juéde hěn méimiànzi.
Being criticized in front of friends, he felt he'd lost face.
Tips
culture
面子 ('face' = social prestige) is the inverse of 丢面子 ('lose face'). 没面子 emphasizes the resulting state - being without face - rather than the act of losing it. Saving face (给面子, 留面子) is a major social lubricant in Chinese culture.