I notice this with how easy white people say 'black people' but when you say 'white people' to a white person (whether you are white or black), they often look noticeably moved by the idea. This I think is because their totally dominant world view has been slightly deconstructed and that their preconceived image of 'normal' has been challenged. I sympathise that people cannot always relate to others (whether white or black), but overall I don't think most white people realise how different life, experiences and interactions are as a non-white person. Simply highlighting that difference is trauma to white people's 'universal' notion of the world, white people then react to that trauma in many ways, crying about it is a particularly undeveloped way of handling the situation, outwardly being hostile as a result of uncovering that the world isn't really how it seems to them is even more immature and demonstrates how society has failed to civilise people in their interactions in the world (I'm politely saying they're inherently dumb racist idiots).