I’m not trying to argue with you, but do you realize you’re saying that stating a fact about someone’s demonstrated ignorance is making it personal but couching the same statement in artificially subjective language is not making it personal? Where’s George Orwell when you need me?
Saying "that statement is false" is not making it personal. It spurs debate not enmity. Saying "you are a liar" is making it personal. It causes flame wars; it stirs up contempt and I do not tolerate it on the Religion Forum.
As another example mentioned elsewhere - consider the difference between telling your child "that was a stupid thing to do" and telling him "you are stupid." When a parent opts for the latter, his child will either believe him and fulfill the prophecy or else he will become indignate or rebellious.
Ditto for the difference between saying "here's something you might not know" and "you do not understand."
And, A.A. Cunningham, my name is not Alex.