You see it everywhere. For example, the race chart here lists whites first. For other charts where category has no particular ordering (for example, technical competence), the bars were ordered by current salary. It's not even by relative share of the population, because there are more hispanics than blacks I believe.
Also, I wonder how the presence of 'other' throws off the numbers, because I bet many blacks are used to putting in 'other'. I know as a minority myself, I often check 'other' on these forms. It's no one's business and will only serve to hurt you.