This is an interesting thread.
I do agree with safe spaces for people to talk freely about race for non white people.
I think it is equally important for white people to have safe spaces to talk about race.
Culture is such a minefield. I, a black woman am married to a white man.
I was born in the UK. DH in another white majority country.
As a result of being born in the uk, I feel I know so much more about white culture than many white people know about non white culture ( I don't want to say black culture because there are so many other non white cultures in the uk). This because I am a minority.
OP, you posted that you attempted to talk to your white colleagues about white privilege and they weren't having it. I would push for a separate white discussion group and slog the race issues out.
It will be difficult, but hopefully it will provide a safe space for difficult things to be said.
I trust that eventually, as a result of having these separate conversations, especially in the capacity of your chosen profession, joint conversations will happen in a space where all participants white and non white are confident to speak up.