Sheldon

A Sheldon is someone who comes across as cold, distant and mean (will 100% make jokes that come across as inconsiderate and rude). Don't be fooled though - a Sheldon is most likely super warm, sweet, kind and caring. Find yourself a Sheldon. They're ruthless but beneath the cactus exterior, they're just cute mush.

John: Did you see that asshole over there?

Lizzy: Oh that's Sheldon, don't let his rbf fool you, he's actually really nice.
John: He's a bit cute too.