I've lurked over there a bit. The one thing that really annoys me is their general "woe is me, nobody understands our pain" mantra.
This fanbase didn't appear out of the ether the day Mahomes was drafted. Prior to that, rooting for the Chiefs was an exercise in heartbreak and futility that went on longer than most of us have been alive. And while I was alive when they won Super Bowl IV, the four-year-old me has no memory of it and frankly it means exactly dick to me on a personal level.
That AFCCG loss in Buffalo? The day that I woke up just knowing we'd get a Montana/Young Super Bowl that ended with the soul crushing reality of Cowboys/Bills? That meant something.
So screw your ****ing pain. We had it in spades forever. And Buffalo's contribution to it is not forgotten.