Do you have a "Fuck you for wishing me well in your own way statement"? If not you've entered Dante's 7th hell of epistemology.
You have no rational basis for your claim. What you have is your belief, not a certainty of how Hawking would respond to a given comment. Now you might claim special knowledge transmitted by some unknown means and I certainly cannot say that you definitely don't, but you have no demonstrable basis for knowing the mind of another.
Personally I take any well intended wishes quite as that- well intended, not dwelling on wording. That's rational. I had assumed that Hawking had that basic human quality, understanding others as they intended to present themselves and not on trivialities of "isms".
In the end all knowledge is belief, and you believe you know. Ok but you have two options. One is to try and prove what you cannot or back off. What you will not do is provide a sound, coherent proof.