It’s not a double standard if it represents an equivalent amount of the population, and it’s absolutely not non sequitur to think that the equivalent of diamond is not the equivalent of legend.
I said “closer to 8k” and I mean that because you have to actually win more than you lose to climb past 6500, which makes 6k diamond, not legend.
There’s no way that 50% of bg players are legend, but that’s what people who think 6k is legend want to believe. The stats are clear that 6k is pretty mid for active players - basically the middle third of players is +/- about 500 rank points from 6k each season. That’s not remotely equivalent to ranked legend.