Just a meta comment, I fully agree with you here, but using the word "nah" (especially as an opener) comes off as very dismissive. My guess is that is not your

Just a meta comment, I fully agree with you here, but using the word "nah" (especially as an opener) comes off as very dismissive. My guess is that is not your intention, so I wanted to offer some friendly feedback on it. It may be a regional thing, as where I'm from it usually includes significant body language that clearly shows that it's not a shallow dismissal but rather a "I disagree but not forcefully" or "I'm unconvinced" but in other regions "nah" is used in a mocking way.