Racist has lost its original meaning. It is now a newspeak word used to discredit those speaking about or commenting on percieved or real differences between groups of people.
Sexist is a label thrown at men, and occasionally women, who dare question sexual egalitarian dogma. At its root, the term and the dogma are anti-family, anti-human, and ultimately antagonistic towards the happiness of both men and women.
Calling someone a Nazi is a quick way to accuse anyone with different political views of being morally reprehensible. Nazism is also used as a spectre to deter whites from having any form of ingroup preferance or conciousness. In general, the Nazis are used as a shortcute for pure evil despite many apt examples such as Holodomor, the Soviet Gulags, or Mao's China.
Bigot is a form of Newspeak used to attack those commiting Wrongthink and not adhereing to the politially accepted dogma of the time. Ironically, the term bigot is most often used by bigots themselves to silence differeing opinions.
The word homophobe or homophobic is used to shame anyone who is resistant to the increasing creep towards enforced homosexuality and broad exceptance of pedophilia.