Can white males have sickle cell disease? and if so would their rbc count be low?

Rarely, yes: Sickle cell disease is most common in blacks of sub-saharan west african ancestry. However, other ethnic groups can more rarely have the disease and they would much more likely have the "trait" rather than the "disease, " meaning they are only a carrier would have few, if any symptoms. Please see the answer by sg erman, md for statistics.