Alright, so let's just say someone called Chara and Asriel nerds because of matching BFF lockets(besides we all know Chara's a nerd) and Chara wore that title like a frickin' badge of honor and they even knit matching sweaters for them and Asriel and written on both of them: "Best Nerds Ever". Asriel was also honored.
Both are absolutely nerds with the matching lockets and sweaters so they’d absolutely get that, probably from Sans lmao.
“Joke’s on YOU, Sans. I AM a a nerd!” And then they fortnite dance.