Those who think they're different when really, the just like everyone else and completely unoriginal.
All "Normies" are just generally annoying and should not be allowed to breed with other "Normies" as they're ruining the human race.
"Normies" are just irelevant fucks tbqfh.
The 'it' varies widely from group to group; for nerds, normies are people that can't tell kinetic energy apart from their dicks; for geeks, anyone that scoffs at their D&D capes that they wear when they go to Burger-King; hipsters, anyone wearing and American Eagle shirt...
Essentially, 'normies' are the 'muggles' of the world, if the word 'muggles' didn't carry so much harry potter baggage.
"This is such a normie party. Everyone's just talking about their day at work and everyone's too afraid to get sloppy. I said I listened to metal and got looked at like I had two heads."
"This normie girl at school said I was 'very accepting' for having friends that didn't go to college."