a poser
A poser is a fake who tries to look like they belong to a group they don’t even understand. They also take all the credit for things they didn’t even do.
You’re a poser for trying to be a DJ when you messed up the whole party.
You’re a poser for pretending to be a rapper when you messed up the whole song.
You’re a poser for taking all the credit when you only did one thing right.