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

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.