If you had some double standards favouring each group, it would broadly be seen as fair. Each groups would have separate double standards in their favour, but it would still be equal despite being separate.
The problem is that all racial double standards favour minorities over whites, and all gender double standards favour women over men.
For example, it would be fine for blacks to be the only race with an n-word pass if there was a corresponding double standard favouring whites, a corresponding double standard favouring Asians, a corresponding double standard favouring Greeks/Italians, etc…
It would be fine that men are the only ones drafted if we were also the only ones who could vote.
But when all the racial double standards favour minorities, especially blacks, and all the gender double standards favour women, that’s unfair to white men.
Furthermore, it also means there’s no incentive for white men to feel bad about the exclusion our ancestors did in the past - when the shoe is on the other foot, they are just as exclusionary of us as our forefathers were to theirs.
Also, the groups with the favourable double standards aren’t even the ones who had it the worst historically. Irish Catholics, such as myself, suffered more than any of the others, and unlike them, we didn’t deserve it. We never rejected Christ and his church like certain religious groups did, we developed an advanced civilisation on our own, we were innocent.