Why was nazism considered to be a negation of both democracy and socialism

Like any other ideology, nazism is created to bring happiness. But, there is a couple of twist,

- Unlike democracy, nazism does not believe in the power of the people. It believes in authotarian government that has overwhelming power toward its people.

- It's similar with socialism in the sense of 'toghetherness'. But in Nazism, that 'togetherness' only belong to a single race