Why do we not quote large posts?

In response to:

Hey mrcnja, I have a question. (I’m seriously not trying to be disrespectful in any way I’m just curious) Why is it wrong to quote the post above you? doesn’t that show who and/or what you’re addressing? The person above you knows that you’re adding to their comment, not just stating something out of the blue. It could also add to a joke. (like what I did)