There's no context in the OP, if you read the post she was replying to it makes sense.
She was responding to this post, which itself was in response to ASAP Rocky saying that he didn't sign up to be a political activist and would rather talk about bytches and lean.
Whites don't care protest white on white crime or police brutality when it does happen. Black people are as disproportionately vocal about it as they are disproportionately victims of it. Even then in cases of police brutality against whites and Latinos I've learned more about those events from black people.
Saying that we never unite when there is injustice based on some wack rapper declining to speak on current events is inaccurate...and defeatist.
@Wild self is cool with me but he has a habit of saying that kind of shyt...not out of malice or wanting to "talk down" but I just think out of frustration and pessimism...but there is a pattern.