Why does Jesus say it's wrong to call someone a fool when it is recorded that he does?

'm no expert on the Bible and at the cost of being curesed by puritan Christians, I would dare to answer that it is Jesus's way of proving that he truly was human (Son of God, yet man amongst us). Humans have these traits of controversy. Didn't he go ballistic in the temple? Well that was not like him to get mad and crash everything! These are human traits; they do no good but we have them. To acknowledge and accept, yet master them is the great task we must perform.