Would you care to elaborate on that? Googling "dr lustig fraud" brings up mostly what looks like fabricated "debunking" articles from things like "The Scam Report".
People whose livers are damaged have some difficulty processing fructose, but that is not the sugar's fault.
Dr. Lustig has made a name for himself by demonizing sugar. I do not believe that sugar is the demon it's commonly made out to be.