I do sometimes accuse people of ignorance, but that is not intended to be an insult. I'm ignorant of lots of things. Ignorance is something that can be remedied by education.
I do not consider it an insult, but rather a compliment to be called an agnostic. I do not pretend to know where many ignorant men are sure - that is all that agnosticism means.
He's my father married to my sister. That makes me his son and his brother-in-law. That is such a moral transgression... I cannot see him. I cannot have a relationship with my father and be morally consistent. I lived with all these adopted children, so they are my family. To say Soon-Yi was not my sister is an insult to all adopted children.
The clear problem of the outlawing of insult is that too many things can be interpreted as such. Criticism, ridicule, sarcasm, merely stating an alternative point of view to the orthodoxy, can be interpreted as insult.
I am suggesting that as we go through life, we 'accentuate the positive.' I am asking that we look a little deeper for the good, that we still our voices of insult and sarcasm, that we more generously compliment and endorse virtue and effort.