So starting off with " I am a natural living man" may not be in our bet interest.
Perhaps "Kind sir, I do affirmatively, though graciously assert that, like you, though doubtless not quite to the gentlemanly standard which you do comport, I am a natural living man. Now, my most amiable fellow, whom I do declare, with much adoration, hath treated me with compassion and benevolence, may I beat my meat on the sidewalk?"
would do better.