It's normal to feel uncomfortable and even ill when faced with evidence that we've been living with false assumptions and beliefs our whole lives. Especially when those beliefs are about ourselves and the people around us; who we are as persons, who others are, and how we fit in the world. If we've been taught that we were born with certain qualities and privileges that others don't have, we tend to base our identity and security on those things. Finding out it wasn't really true may be so difficult to take that we may become angry, defensive, or flat out deny that it's possible. It's really a shame that so many children are raised being taught false beliefs about themselves and others, since learning the truth after years of having internalized those beliefs can actually be traumatic.