be mean to sb.
对…刻薄;对…吝啬;是指对别人很差，很苛刻!
例句和用法：
1. Don’t be mean to him,he is just a kid.
不要对他太苛刻,他只不过是孩子.
2. I don’t want to be mean to anybody,but his nosiness is really exasperating.
我并不想对任何人耍脾气，但他这么好打听真叫人恼火。
3. I think you’re being very mean to her.
我认为你对她态度太差了.
http://m.tuzhexing.com/peixun/1105209/