Calling people liars because their lived experience makes you uncomfortable is a sign of your privilege.  It is not divisive for a marginalized person to talk about their lived experience and encouraging them to sweep it under the carpet denies the isms that they are forced to negotiate.

If that’s not powerful, I don’t know what is!! Gave me chills at the truth of it—really!

From: http://www.womanist-musings.com/2012/01/shit-girls-say-to-gay-guys.html