Which in a nutshell is what Irving did in Austria, he was rude and disrespectful, and he was being intentionally provocative.
I don't know how old the people are on this thread but I suggest that only the more advanced in years like myself will understand why this law was put in place in Austria. Not being patronising just a thought.
Look how in the UK they still make jokes and films etc about the Nazis, it is a folk memory, and in Austria with their history it must be even worse.
Giok