Poser

-Pretending to be someone or something you're not
-usually in order to fit in somewhere that you're not wanted
-mostly found in groups such as emo, goth, hipster, or scene
-pretending to like things such as music or clothes, but knowing nothing about either.

There were many posers at the concert who didn't even know the bands that were playing or the words to their songs. They looked completely out of place.