Who did the Nazis discriminate against and why?

I know that Hitler liked people with blonde hair and blue eyes and killed anyone that didn't have blonde hair and blue eyes.

Jewish People...

yes he did like people with blond hair and blue's eye's commonly known as the Aryan race, but he didn't kill everyone with that didn't have blond hair or blue eyes? that's stupid he would have killed alot more then he did if he killed people for that. he discriminated against Jews (obviously), Gypsies they were in the concentration camps aswell, along with Jehovah's Witnesses but they were the only group that could leave when ever they wanted all they had to do was sign a document renouncing their faith to god none did. he also hated mentally handicapped, homosexuals, the insane, prostitutes, beggars, the homeless (ironic because he was at one point homeless.) he saw most of these dangerous because he didn't want anything to infect his 'perfect' Aryan race.