It is okay to generalize about people, describing patterns that are observable and well documented. We need to look at the "rule" rather than the exception. We are all members of social groups and these memberships make it possible to understand certain attitudes and behaviors based on where people fit.
White people must let go of the differences of their group and begin to grasp the similarities and patterns they all share. Because we are members of separate groups, how we think about things can be completely different depending on that group and be must be aware as well as accept this (i.e. don't tell Black people how they should feel about what they are going through, or to assume how they feel).