There is a classmate who always scolds me in space, and the scolding is very unpleasant. He scolds me even more harshly behind my back. I really can’t stand it anymore. What should I do?

Nothing is wrong, just treat it as a prodigal dog barking at you. If you "retaliate", then she will scold you more and more harshly. Find your own reasons first and think about it. Think about whether there is anything you can't do to her that you can't handle. If not, in space, then you will fuck her up and not let her speak in your space. In reality, then meet her once and curse: FUCK YOU~ ~~~(To summarize)