He can't take a joke．他开不得玩笑。

Take a joke

定义：Accept teasing at one's own expense （接受一个要付出代价，自我犧牲的笑話）
例：Sam really couldn't take a joke. （山姆真的开不得玩笑。）

Take a joke这个成语经常是用否定式的。例句：

My brother couldn't take a joke.
我老弟开不得玩笑。