more fool somebody for doing something

Từ điển Oxford Advanced Learner 8th

ˌmore fool ˈsb (for doing sth) idiom
(informal)used to say that you think that sb was stupid to do sth, especially when it causes them problems
•‘He's not an easy person to live with.’ ‘More fool her for marrying him!’
•‘I know I shouldn't have given him the money, but I did.’ ‘More fool you!’
Main entry: ↑fool_idiom