Concerning all the "erasing history" BS why don't we allow those who want to display it can do so and those who do not don't have to. You anger and hostility must be about more than a flag.
For the same reason you'd wet your panties over me flying a flag that depicts your burning house and the charred corpses of your family with me dancing and laughing around them holding a gas can and lit match, in your face, in public places, everywhere you go, for your entire life.