Men and women of all races can be called a c**t and feel a certain way about it. Some will be more triggered by others depending on their own history with the word.
If my neighbour and I were to be called n**rs, she'd probably be confused, slightly shocked because she is white. I on the other hand would be crushed. No matter how many times I've heard this word, it does not lose its potency.
I understand his disability. I understand many disabilities and adjustments.
John had a right to be there. He also used a word (unintentionally) at least 3 times, all to black people. The apology should be as strong as the plea for understanding of his disability.
Expecting those who were harmed to adjust over and above the harm for his sake is unreasonable. If I have a condition that causes my arms to spasm unintentionally and I poke someone in the eye, I can explain my disability and apologise for the pain caused. If I have a processing disorder and miss an email that causes a client to miss out on something important I can apologise for the harm or delay etc. The processing issue has happened to me during the course of my work and I have apologised.
Black people on a global stage, amongst their peers, minding their own business having to hear this and yet again be told to stay quiet and center others over and above themselves. I do not think so.
No one gets to tell the black people in that room how to feel.