you've heard a couple songs that somebody told you were "teh methulkore!", you didn't like them, so anytime you hear another band that is being described as "metalcore", you are 99% certain not to like them because you've convinced yourself already that you don't like "that kind of music". in all reality, you wouldn't even give them a fair listen, probably turning off the song as soon as you hear that it has similar production values or guitar chords or vocal styles to some other metalcore band that you heard once and didn't like.
ummm... rambling...
oh yeah, you're narrow minded, whether your narrow little mind can recognize it or not.