...It’s that Donald Trump is losing 20+% of the Republican vote to a woman who isn’t white.
To Democrats, voting for a woman might not be a huge deal. Voting for a brown person may not be a huge deal. Voting for a woman who is brown or a brown person who is female may not be a big deal.
But, to Republicans, who have spent the past generation being pro-white and pro-male, losing 20+% to a brown woman candidate indicates that that number would be higher — likely MUCH higher — if that candidate were a white male.
Just factor that into your calculations.