No one here that I've seen would even remotely disagree that Black people don't have a right to be offended over racial slurs or demand accountability from the organizers of this event, who definitely could have handled this better so that it does not take away from this celebration of Black artistry. I fully agree that the people affected have the right to speak up about it.

However, as someone with Tourette's (not this variety or severity, thankfully), you really don't seem to understand the condition, or are at least letting your (fully justified) anger towards the situation get in the way of discussing your points. This is the reason you are receiving pushback, not because of a dismissal of the issues and hostility that PoC face.