Why did you feel it was relevant to mention the race of the individuals involved?
Having to worry about offending someone for describing a situation is getting old. Please go cry wolf somewhere else.
Knowing the details allows for a better picture of the ordeal.
Example a group of white guys beating a small handful of blacks in the south in the 60's describes in my mind a racial beating. If I had left out the races and said a group of men fighting in the street it doesn't help to explain the situation.
If race has relevance when its beneficial for the minority it certainly has relevance when it isn't.