TBH, I didn't particularly like this response. I think it might have been better if she had welcomed them, and mentioned something about learning about the real world or something.
To me it was needlessly divisive. "You don't belong here, go back to where you are welcome" is how it came off, which feels especially wrong coming from a black woman. I see how this part was a bad take, just seems like segregation wasn't that long ago. And we don't need more.
I absolutely see both points here. But maybe do both? Like “Are you sure you aren’t supposed to be at the smaller rally across the street but you’re welcome to stay if you really care about the country and want to join the good guys”