Is attacking someone ever OK?

Anyone that resorts to name-calling knows they have lost the battle. I think emailing people is harment. I wish people could grow up and respect one another's opinions. You may not agree with what I say, But, I will defend to the death your right to say it. And, I will be respectful. I am no more right than you, nor, you than I. We need to agree to disagree. Not disrespect one another.