How To Answer To Someone Saying D&D is stupid?

I’m a senior in a US high school, so people’s opinions are still very important to me. At my school, the board game club consists of like five people, and in the rest of the school, everyone thinks the game is for people who have never been in social interaction. I’m not socially awkward at all, and I don’t know how to answer someone saying it’s stupid or nerdy. Why do others think it’s nerdy, and how can I convince them it’s a good game?