There are many reasons why you should learn to put yourself in a person's shoes and form a person's character. No matter where they come from, think from their perspective. "Others bring food and take it without permission" can be understood as casually. We are all classmates, so don't stand on ceremony. Don't isolate yourself. Borrow a sentence from others; You see others different because you think you are different from them. I can see that you are not old enough to get along with each other. Good mentality, hehe.