"Perhaps we could discuss this like adults?"

I absolutely agree with you there Kim - except that "like adults" tends in practice to typically mean being bloody-minded and aggressive and hypocritcal, so we are discussing it like adults already.

So perhaps we could instead try and discuss it like level-headed and rational human beings, recognising that just because we disagree with each other, slanging each other off is not helpful. (Not even when in a fit of anger one of us has said something exceptionally stupid.)