There are a few things that can be annoying about the smart nerd in the classroom. First, they may be constantly trying to show how smart they are by answering every question and raising their hand a lot. Second, they may be know-it-alls who never stop talking. Third, they may be so focused on their work that they never pay attention to anything else going on in the classroom. And fourth, they may be always correcting others and telling them what they're doing wrong.