Not the exact wording but the general premise behind it is a fair counter point in any disagreement. When someone is attempting to gain a higher moral authority, bringing up any hypocrisy is a reasonable thing to do. If pointing out hypocrisy is then dismissed, it is reasonable to assume the other person is not arguing in good faith and therefore should no be taken seriously.
Correct yes, I can see there are two ideas here. We both agree immorality is independent of conversation and no matter what happens in the conversation it will not make the immorality untrue. The point I am trying to articulate may be more whether or not it is appropriate for someone who is simultaneously kicking puppies to point out how immoral it is that I am kicking puppies, while refusing to acknowledge the immorality of their own puppy kicking from a social point of view. Thoughts?