0250_to do a disservice to someone

0250 Daily Easy English Expression PODCAST—to do a disservice to someone
中譯: 幫倒忙
Dialog at: 3:53 and 6:36

A: You’re giving your kid juice boxes.
B: Juice is good for you.
A: You’re doing your kid a disservice. Give him real fruit instead.
B: But this is all he likes…