Is it true or just another internet myth that there are white and also there are black hackers.
That they call themselves this and also they groups or communities that they hang around in.

I also heard that the white ones are the good hackers and wont do you any harm but the black hackers will.

Is this all aload of nonsense?

Sounds like nonsense. All the "good" hackers are either busy doing their own business or protecting other online businesses.

sounds to me like wishful thinking by hackers who want to appear to be the good guys. Unless they're getting paid by the government, they're nothing but punks.