Two reasons seem to stick out:
1. Living in this racist and sexist society, black females have to put up with both problems, and we shouldn’t take it too kindly. However, we cannot let hate consume us.
2. We were raised that way. Many black parents teach their children to be snotty; mine did. Did yours? Why were we raised that way? I don’t know.
Regardless, it is hurting black females, not helping. We are in a society (especially in the workforce) in which competence and attitude mean almost everything, and often gender and race matters, also. As black females, we already have two strikes against us. We do not need a third (a bad attitude).