It's totally the point. The problem is they are running out of "outsider" groups they can demonize effectively so they have turned towards their own potential voters (mainly women).
As much as they want to turn transgender people into the new jews, most people just don't have that much of a problem with them.
IMHO it's harder to demonize a group that might include your son or daughter. Their racism persists because there are no white people who discover that they've actually been black their whole lives.
Although, I bet if those racist assholes took DNA tests many of them would find they did have some African-American blood, especially if they were from the South.