Personally I don't give a fuck if you use Auto-Tune or not, but your sound fits the style of the bands you record, and that should be enough, shouldn't it? The trend in metalcore, deathcore, crabcore, whatever is a polished, overproduced sound, and you do that perfectly.
If people hate Auto-Tune, stop listening to music where it's used.
If people hate Auto-Tune, stop listening to music where it's used.