小题大作
[词典] make a fuss over a trifling matter; a fuss about a trifle; a great fuss about trifles; a fuss about nothing [a trifling matter]; a storm in a teacup;
[例句]是啊，我想他的老板是一个爱小题大作的人。
Yeah, I think his boss is someone who likes to make a mountain out of a molehill.