I don't think anyone would disagree with that, @bibliomania
If she enjoys lesser heard voices, then that is great and needs no justification.
However, the harm comes when -as she seemed to suggest-authors should be avoided because they are dead, white and male.
If a book is written by a first nation or black author but it is rubbish, should that book be held up as more desirable to read than say, Jude the Obscure for no other reason than one is by a live woman of colour and the other is by a dead white male.
I'm afraid I think that is nonsense and I'm going to go further than that and say it is dangerous nonsense.
If the colour, state of life and sex means more to the reader than whether the book is a great one, then do as you please but do try to push through the thinking that these things are more important than the literature itself.
By this thinking, the works of Vermeer, Renoir, Mozart and Chopin will all be seen work to be avoided in favour of artists and composers who are not dead, white and male.
Anyway, I will not be discounting culture on the grounds that it was made by someone who had the misfortune to be born white and male and the even greater-if unavoidable-misfortune to be dead.