人情世故

He felt people were contemptuous of his lack of sophistication.

他觉得人们看起他人情故。

She is unschooled in the way of the world.

她人情故；她丝毫态炎凉。

He's very young and inexperienced, and doesn't know about the ways of the world.

他还年轻, 又缺乏, 得人情故。