What you said ealier about "power metal=homosexuality" made me sum up these descriptions.....
Nu-metal = Yo yiggidy yo, one finger power chords in drop D, Yo yiggidy yo
Death Metal = uuuuurrrrrrrrrrrgggggghhhh, goreeeeeeeeee, cunt, seman, vaginal fluid, insert catchy double bass groove, repeat
Grindcore = Fuck society, politics are a sham, *blast beat* lead singer wobbles head up and down....
Black Metal = dark ambient keyboard intro,....Odin, Satan, Luciferous Eden, buzzsaw guitar eeeeeeeeeeeeeeeeeee, hot chic on an alter, virgin sacrifice, drink the blood of Satam, repeat
Hardcore = "This one goes out to all the kids that got shit on when they had no where else to go to" chugga chugga chugga.... AAAAAHHH circle pit....
Metalcore = "This one goes out to all the kids that got shit on when they had no where else to go" chugga chugga, ...insert singy chorus part that touches the soul whilst still being "hard",... wipe away tears,... repeat,...chugga...