The clash between the jewish residents and the nazis was buffered by large numbers of police but none-the-less, several brutal fights broke out. For the most part, the protesters were beaten and bloodied and took refuge behind police.

This tells us two things:

1- these neo-nazis are really stupid.

2- the participants seem to have forgotten that the nazis viewed the Czechs as a sub-human race whose only use was as slaves in the factories and fields of the new Reich. It was after all, the nazis who conquered and destroyed Czechoslovakia in W.W. II. 

Then again, what would you expect from nazis? They're never the shiniest apples on the tree.