Why don't people realize that ALL races are racist, not just one in particular?

People are so quick to point out the flaws of a certain group. People make generalizations like "all whites are racist" or "all blacks live in the ghetto" etc. It's so rediculous. The most pointless thing is the "slavery blame game." People don't seem to realize that EVERY SINGLE RACE HAS HAD SLAVES AT ONE POINT IN TIME IN HISTORY!!! The Egyptians enslaved the Jews, the Mongols conquered and enslaved many people in China, India and Eastern Europe, the Aztecs enslaved many tribes in Mexico, the Romans enslaved everybody in Europe and around the Mediterranean Sea, the Arabs enslaved Africans, the Europeans enslaved Africans and Native Americans, etc. So why do we still have racism? We can't we realize that we all have faults and get over ourselves?