"No one gets to tell us how to react to racism until they’ve walked a mile in our skin."

Wrong. No one gets to tell you how to react to racism, EVER. Of course, you don't get to tell anybody how to react to how you react, etc, etc. It's a free country. The problem with freedom of speech is that there a zillion assholes who will speak obscene things. The value of freedom of speech is that occasionally somebody will make a constructive and useful point.