In all of the reading I've done about the National Socialists, I've simply not found evidence they were in any way antithetical of socialism. Communists proper may have declared "workes of the world unite"
Okay, Communists =/= Socialists in the same way that Capitalism =/= Anarchism. I know that it's really easy to use guilty by false association, but at least freaking try here.
Now let's take a moment to review the core goals of socialism around the 1930's and 1940's, based on the political platforms of the major socialist movements at the time, the French popular Front, the German SDP, the British Labor Party and the Spanish People's Front. These were actual member parties of the socialist international. These groups called themselves socialist. These groups had the support of the labor unions. When people talked about socialism, these were who they talked about. What did they want?
1) Care for the poor
2) Workers own the means or production, or some suitable substitute
3) Workers right to organize
4) A just legal and political system
5) International solidarity
Let's see how the Nazi's stack up:
1) No, they diverted all the wealth of the nation into war
2) No, besides the war thing, crony capitalism flourished
3) No, they sent paramilitary thugs to kill union organizers at least until they opened up the concentration camps
4) No, just, no
5) No, enslaving the socialists of both your country and your neighbors country in the same concentration camp does not count
So let's review broadly:
1) The Nazi's fought against everything the socialists stood for
2) The Nazi's publicly denounced the socialists as parasites
3) The Nazi's fought the socialists with paramilitaries
4) The socialists were the only ones who stood up to the Nazi's
5) WAR IS PEACE, FREEDOM IS SLAVERY, and IGNORANCE IS STRENGTH
Yeah, the first four points might point against the Nazi's being socialists, but the fifth point is a really good argument.