First nothing is justified when it comes to race. I’ve been in situations that are reversed a few times and there is no justification, black, white or any other race or religion.
I would tend to say the woman was concerned about your call and had her boyfriend or whatever call to check things out. That’s my opinion.
As for calling him to really get answers, I say let it go. If he calls again then deal with him, but for now it sounds like your roommate took care of things.
Sorry you had to deal with this.