A black friend of mine says that non-black people cannot possibly understand what black people go through as they have not "walked in my shoes".
This morning on the radio I heard a NY cop being interviewed say, "Until you have put on a uniform and a badge, and strapped on a gun, and walked a beat, you have no right to criticize me for how I do my job." (paraphrasing, but that's pretty close)
Both, obviously, saying that unless you've 'been there, done that', you don't know what you're talking about and your opinion is irrelevant.
This question is specifically about race relations, not a general concept.