One of my favorite memories was in a 10th grade science class where one quite intelligent student was making fun of another who stumbled over a question. I address those sorts of things immediately and quickly (no one knows everything from the cradle - can’t know what you haven’t been exposed to - wouldn’t be in school if everyone knew everything). Not long afterward - within the week - the two were working together being willing lab partners. Other top students also started helping those not quite at the top too.
Kids can be wonderful. They sometimes just need guidance and guidance doesn’t have to be punishment. It can just be opening their eyes.