This boy has a strong desire to express himself. His sense of existence and strange behavior in class are his real feelings from the inner world. The more someone praises him, the more exaggerated his reaction will be. If you don't believe me, you can praise him to his face for walking with grace and style. The harder he shakes it, the more exaggerated it may be.
I used to be a boy, with developed limbs, simple mind and no bad intentions. With the growth of age and the continuous enrichment of experience, it will gradually change.
The boy is seriously lacking in self-confidence. As classmates and friends, we should not look down on him, let alone isolate him. But to care about him, love him and grow up happily with him!