There are a tiny minority of liberals who, rather than embracing breaking down barriers and a hunky-dory co-existence like the rest of us, erect barriers of purity and constantly call people out.
They're annoying.
On the other hand, that's the dominant mode for the entire right half of the spectrum so take their complaints with a grain of salt. And who gives the above-mentioned annoying liberals their biggest platform? Right wing media. Gotta feed the wurlitzer.
It's not a "differing and diverse political opinion" to think people of color and women are inherently less worthy, it's just racist/sexist.