A big part of that is because people tend to oversimplify social phenomenon...and, in the process, they abandon nuance.

Many people on the Left say that racism is only "a white problem to solve," and that people of color are the only ones who can be targets of racism.

Many people on the Right say that racism is largely nonexistent, in the present day.

Both of those sides want to brainwash the masses into accepting their way of thinking.