Although I am sometimes overly sarcastic or critical on the forum in my persona as a gladiator, in real life I am rather more diplomatic. I would not agree to disagree because it is a way of agreeing that we disagree.
My usual response is to say, that's an interesting take on things. Or, I'll have to give your comments some thought. Even, it will take me a while to get my head around that.
My wife simply says, 'whatever' to any challenge or unwelcome comment. Most irritating! Thank you for letting me share.