Denial of what? A photograph is proffered, an assertion is made.
Unless there is substantial proof to back up the assertion has the weight of that which it asserts.
That is, OK, you can make a claim that so-and-so holds such-and-such an attitude, but if you haven't got email/video/confessions, the, so what?
I, for one, am committed to laughing at anyone claiming I'm racist just because you can do some math and find that many of my circles have a preponderance of European extraction. Big deal. I've also served in the military, which is all diversity. Also, big deal.
This is not to dismiss entirely the possibility that some group IS exclusive.
Merely, again, laughing at the Racism/Sexism Industrial Complex, which has made a relatively destructive career out of pointing fingers with dubious justification.