I think it is with the inflection, so if done in writing one would need to use a format that allows for it:

"I understand how you feel that way about (insert topic)."

Which, if responded to with a "You do NOT know HOW I feel", is followed up with:

+ "Yes, that is correct. I do appreciate that our opinions differ."

I know some would say that is over analyzing it, but in all fairness to NM, I believe he needs to approach and process it this way for it to sink in.