Question

I don't like it when others laugh at me in public or think poorly of me behind. it能改that吗?

Answer 1

不能改。

参看下面解释：
在take, hide, put, appreciate等动词以及一些表示爱好的动词（like, love, enjoy, hate, can’t stand等）之后不能直接跟宾语从句，所以用形式宾语it再加宾语从句。
I take it that he's not interested in the book. 我猜想他对这本书不感兴趣。
She hid it that she was married. 她隐瞒了她已婚的事实。
I don't like it when you look at me like that! 我不喜欢那样看我。
I hate it when people speak with their mouths full of food.我讨厌人们满嘴食物讲话。
I would appreciate it if you could give me a hand.我会很感激你帮我。

Answer 2

不可以的。这个是一个固定句式。it 在句中作形式宾语，代替when others laugh at me in public or think poorly of me behind.