A boy in our class dreams of having a good friend with me. Somehow, many students now say that my friend is annoying. How can I persuade her to comfort her?

That's someone else's dream, not hers. Don't persuade her so much, accompany her to divert her attention, don't mention it, help her when others say it in front of you, and take her away from those boring people. The most important thing is to divert her attention. If someone attacks you maliciously through this incident (I dreamed about you and pig xxx yesterday), the premise of striking back is to ensure your personal and property safety.