You might think the comment is "overall appropriate and constructive for the forum" because you don't realize that it is sarcasm. The intended meaning is comple

You might think the comment is "overall appropriate and constructive for the forum" because you don't realize that it is sarcasm. The intended meaning is completely different from what you imagine it to be. The opposite can also happen, particularly when somebody has a belief system very different from your own. You might wrongly assume that the comment is sarcasm, when in fact it is thoughtful and substantive.