Paraphrasing James Baldwin, white people have trouble acknowledging their whiteness in the way that a black person being lynched has to look down at the entire crowd of angry white faces while a white individual in the crowd only has to look up at the one black person hanging from a tree.
Non whites have a better grasp of whiteness because we are forced to grapple with it everyday. White people aren't.
Simply saying white people aren't capable of acknowledging their whiteness - or that they will have a hard time with it - sounds dismissive and makes it really hard for white people or anyone else to want to get on board with talking about it. To me it sounds condescending, and actually retracts from having an actual discussion. If you want to just talk about why white people are bad, then just say that - don't mask it with "let's have a discussion about race". In my mind, those are completely different things.
I'm not white, I'm Latino - and if someone, white or not wants to have a discussion about the difficulties of being a minority in this country I welcome it. I like to talk about experiences and discuss what can be done to improve race relations between all. White people aren't the only ones that are racist even if they are the overwhelming majority. Every race has some issue with the other.
Edit: I'm not talking about you specifically. It's just something I've noticed across the board (no pun intended).