So they are just like Nazis?
Yep.
Racist, tied at the hip to extreme neonazi British gangs, antisemitic, the head of the BNP denies the Holocaust happened or at the very least was exaggerated. They also publicly opposed Johnson Beharry getting his VC in Iraq as he was black and Caribbean. They refuse to support any campaign by the the much loved Gurkha regiment for better rights, pay or to stay in the UK after service.
Nor are they fond particularly of Catholics, Sikhs, Hindus, gays, mixed race people even if half-white.
The BNP simply do not like Jews or anyone of colour. Its really that simple. They want a white only Britain.