"I think in a job interview situation for a senior/promoted post, very often women and non-white men are expected to prove themselves in a way that white men aren't - because the starting perception is different."
Yes, the starting point is that white men are natural leaders, competent, reliable and that the woman/ non-white person may have got there by some sort of fluke so we'd better be more careful about him/ her.
I remember once having a subject teacher who wildly over-estimated my ability in her subject and wildly under-estimated that of a classmate (I'll call her N). This is because I was very good at everything else
so she expected me to be very good at what she taught, while my classmate was only average at most things, but she was passionate and excellent at this particular subject. My teacher didn't even want to let her do the A Level because she didn't think she was good enough.
Every time I said or wrote the bleedin' obvious, I got credit for covering the basics, while my classmate got a "FFS, that's so bleedin' obvious why are you bothering, that's as far as you can go, you'll only ever be able to deal with the basics, you can't possibly handle the complexities" look. When she got a higher mark than me for the A Level, our teacher was astonished, but we weren't - we knew she'd been favouring me and underestimating N.
That's what happens with white men versus other groups all the way through life. The difference being, that I knew it was happening even though I was 16-18 and many of them don't, even if they're 60
(largely because they don't want to know). And of course, that at some point we got assessed by someone who assessed us purely on our ability, not on what s/he thought she knew about us. That never happens in real life.