Calling you an idiot would be an insult to all the stupid people in the world. You are just restating my own argument and then trying turn it against me. How do you ever suppose to win this way?

My argument remains the same. Even native speakers can make blunders in their language. Even you make big blunders as you write. If you want, I can point those blunders out to you. I am sure you do not want that, right?

The thing is simple. Whether you hire natives or non-natives, competence is what is needed. And you can find competence, or the lack of it, in both groups.

You have lost the argument. Do not make a fool of yourself by furthering this point. Otherwise, I would 'edit' and 'correct' each single line that you write. I hope that you understand.