Sorry fella, while I think Nazis are vile scum, I don't like government prohibiting speech on grounds of preventing violence or causing breeches of peace.
Kinda vague.
If brown-shirted scum decide to march on Washington in some attempt to seize power, fire at will.
Personally, I'm more concerned with the business suited Nazis actually sitting in Washington who hide behind pseudonyms such as "Democrats" and "liberals".
I am not a fella, If you don't like the Supreme Court's opinion, take it up with your government officials.