Why is the left so intolerant of people who express themselves as the race and gender they identify with?

"Delaware County Councilman Ryan Webb has sparked outrage after declaring himself a lesbian woman of color in a Facebook post made earlier this month. He is pictured here in a mirror selfie, with a gun seemingly around his waist"

He's been getting death threats from the left. Why can't people just live and let live?
Why is the left so intolerant of people who express themselves as the race and gender they identify with?
Why is the left so intolerant of people who express themselves as the race and gender they identify with?
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