The best explanation for arachnophobia is as a learned or cultural behavior.
True to a point. If a person associates the outcome from the bites, he might develop a phobia to it, on the other hand I can say for myself it wasn't. I was not arachnophobic before I was bitten by a black Widow, and other that 3 days of agony, there were no other effects and I still am not arachnophobic, 41 years later.
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969
Since Evolution is only ~90% correct it should be thrown out and replaced by Creation which has even a lower % of correctness. W T Young, 2008