> any reference to them will have the political left call you a nazi, racist, sexist and pedo to boot
I think this boils down to the fact it's typically just a thin veil for motivated reasoning.
And that's the most anti-scientific attitude a person can possibly have, what you just said.
What's the veiled motivation of a white person who says that Asians are intellectually superior to whites?
Leftists see racism and sexism everywhere - their ideology focusses on that and they pick up on any excuse they can to label people as that. It's actually a horrible way to treat their fellow humans.