得了便宜還賣乖 的英文怎麼說?

Andy: When we were settling the bill, David paid $8 when everyone else paid $10, but he was still complaining.
Ben: He is one of those people who pretend to be a victim after gaining an advantage. Let's not invite him to lunch next time.
Andy: I know. Beneficial actions often go unappreciated or are met with hostility.