Over the last two years, my brother changed in a bad way. The closest to explain his behavior is that he always tries to be superior and smart-assish now. I didn't do anything for the cause of his behavior. When we talk about random things, he always tries to correct me, and belittles my opinions and gets annoyed. He even tries to find the smallest mistakes and tries to correct it only to look superior near me. As an example, when I try to say something is 90%, he then says "no akshually, it's 85%" or something like this. Sometimes he deliberately asks me a chain of questions only to find an error and to feel arrogant. He also kinda behaves like a computer and wants exact answers. In addition, when I talk, he changes the direction of the topic to his "scope" and questions lot of things back only to let me get confused. How can I improve the situation? The only thing that helps a bit is to stonewall him.

Why can't plain girls be real