“If this banner was a blank banner, we wouldn’t be here,” said Gens. “If it said ‘Support Our Troops’ we probably wouldn’t be here. If it said ‘Black Lives Matter’ we wouldn’t be here, because this gives way to all sorts of selective enforcement.”
I see that “if things were different, they would be different” remains a standard for racists and their defenders.
“White supremacist banners get taken down more often than other banners” isn’t actually evidence of unequal enforcement, because white supremacist banners almost certainly get reported to the cops immediately by a lot of people, whereas other banners are largely ignored if they aren’t offensive. Especially because it’s entirely legal to put up banners if you have a permit, so people have no reason to call the cops every time they see a banner.