Your facts argue against your point. In your words, a city, the government itself, tried to block the "Unite the Right" rally. Meanwhile, Black Lives Matter "was treated with far more disdain"(presumably by private actors exercising their own freedom of speech - not government actors?). It sounds like there was plenty of disdain for the "Unite the Right" rally as well - I can't imagine what else would lead a city to break the law in an attempt to block it.

I'm not sure what outcome you would have wanted from the situation - the government should have further tried to supress people against BLM? Who's the minority power in your scenario again?