Controversial opinions on metal

Where exactly did the suffix "core" originate? Every genre that ends in "core" (i.e. metalcore, deathcore, etc.) inevitably exacts hatred and derision from kvlt metalheads. So what the fuck does "core" mean exactly? This has always bugged me.
 
Where exactly did the suffix "core" originate? Every genre that ends in "core" (i.e. metalcore, deathcore, etc.) inevitably exacts hatred and derision from kvlt metalheads. So what the fuck does "core" mean exactly? This has always bugged me.

Hardcore punk but, nowadays, it's (d)evolved into a more "tuff" oriented breakdown-heavy genre with bands like Hatebreed, Throwdown, Since the Flood, xTyrantx, etc. Metalcore and deathcore bands combine that style with metal. It's not rocket science, really.