I've never seen him causing any problems with anybody. It's rather closed-minded to block him due to his username. It might be more productive to engage him and try to understand what his beliefs are ...
There's never a really good reason to hate other people, especially not for something they can't change like skin color or birth country. If they are willing to refer to themselves as a Nazi, then I am willing to see them how they want to be seen, as a Nazi.
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