a poser - A poser is a fake who thinks they're cool but is actually a

A poser is a fake who thinks they're cool but is actually a sad, lonely loser.

Hey, you’re a poser for trying to be a rapper when you can’t even rap your own name.

You’re a poser because you wear a hoodie inside out like it’s a fashion statement.

You’re a poser for pretending to be a gamer when you play Fortnite for five minutes and then quit.