Hardcore is more than music. Its a way of life for some many people. Not just from the begining of punk rock since the beginning of rock and roll in general people who listen to hardcore live a different lifestyle, dress a different way, listen to louder music than the average person does.
Goofus listens to pop punk hes not hardcore at all.
Gallant listens so hardcore/metal and dresses different hes so freaking hardcore.