Da'Vonne is not a bigot.

I think she just made an ignorant comment while lost in the heat of the moment. It's sad that she views Audrey as a boy in some part of her mind, even if it's her subconscious, but it happens, I guess. Dae recognized that it was the wrong thing to do and is visibly upset about it, proven by the fact that she felt the need to confess to an open ear.
It's disappointing to hear, nonetheless.