To list a few generically unpopular viewpoints:
The Holocaust never happened
Jews rule the world
Diversity is a codeword for white genocide
Transexuality is a mental illness
Homosexuality is morally wrong
Climate change is a myth
Most Muslims are bad
Race exists and the IQ gap between races is genetic
Bush did 9/11
World leaders are reptilian aliens
Paedophilia is comparable to homosexuality
Arts degrees are useless