The guy was nice enough to explain his post that you got confused about. Rather than be thankful you used that as evidence that he was not clear and lectured him on it.
I gently suggested that the problem may have not been with his post but with your understanding. Apparently you missed the point again.
If multiple people misread the post, clarity might be the issue, not comprehension. Dismissing that as misunderstanding doesn’t add much. Let’s keep it constructive.