>>A lot of scholars consider Immanuel Velikovsky a crackpot. I dont know of anyone who accepts his radical redating of dynasties. The fourth century is pretty well-documented by ancient standards.
A crackpot that was an intimate colleague of Albert Einstein with whom he co published “Scripta Universitas”, the 1920’s scholarly journal based in Jerusalem, in pre-statehood Israel. They were neighbors in Princeton and their wives played in a string quartet together. THAT Velikovsky? Of course you refer to him as a crackpot without ever reading a word he wrote. Typical.
There is a logical fallacy called the argumentum ad hominem. I guess this would be the argumentum ad amicum hominis.