What is the significant difference between deathcore and metalcore?

Metalcore,Deathcore,Brutal Death Metal. I lump all three into one genre, 'SHIT'. If you listen too these genres hope you die.
 
I hate metalcore for how many fucking emos and scene kids listen to it, but deathcore fans and bands usually just wear what ever normal metal fans wear,by that i mean "what ever they can find"..
 
Long story short; there's no reason to listen to metalcore or deathcore because they're so inferior to real deathmetal or fucking grind.
 
Nursecore is when doctor fucks a nurse, it's sometimes being reffered to as patient music.