Ok, I was not aware but it still doesn't make it right for ANY PERSON whether black, white, Hispanic or any other race to be called scum
If a person of criminal background or intent does something to me, or intends to do something to me (rob, injure, etc.....), you can damn well bet I will call them whatever name I damn well please, including scum.
That means, that if a black person, a white person, an Asian person, a Hispanic person, etc. causes me personal, physical or economic harm, I WILL call them scum. Or very likely a lot worse.
If people have a problem being called "scum", the easy prevention to that is to live an honest, hardworking and honorable life.