a storm in a teacup 小题大做

Used when people talk about a small event, or a small problem as if it were a big tragedy.

例句：

Kelly's complaints about the wedding cake were a storm in a teacup. The cake was beautiful in my opinion.

凯莉对婚礼蛋糕的抱怨简直就是小题大做。在我看来，蛋糕很好看。

If Robert doesn't drink enough coffee in the morning, everything is a storm in a teacup.

如果罗伯特早上没有喝足够的咖啡，他会对一切事情都小题大做。