Lena Williams writes of this common white behavior in her book It's the Little Things:
Anytime we are asked to speak on behalf of the fifteen or twenty million blacks in America, it's off-putting. . . Brenda Canty, an outspoken black woman living in Brooklyn with her husband and two sons, says she has learned to respond to the question with a question. "I ask, 'So what do whites feel about so and so?'"
I have taken to using these little opportunities to speak on behalf of the fifteen million blacks in America.
"Well, speaking on behalf of the fifteen or so million of us black folks, we're thoroughly ticked off that whites just can't get over the O.J. thing and go on with their lives," I say with a sly smile. "And if you white folks fail to do so, us fifteen or so million blacks might just take to the streets and riot again!"
My tactic usually solicits a conciliatory grin from the questioner, who by now, I would hope, sees the absurdity of asking one person to speak for millions.
(PS--I borrowed Mwatabu Okantah's photo from his online interview--I hope he doesn't mind.)