"Also, if you don't understand what people mean when they say "Black Lives Matter" you are really lacking empathy and saying "All lives matter" is missing the point so hard, that yes, it borders on racism."

That is a meaningless statement. One could just as easily reverse it:

Also, if you don't understand what people mean when they say "All Lives Matter" you are really lacking empathy and saying "Black lives matter" is missing the point so hard, that yes, it borders on racism.