The post from which you "got that Feeling of Authority speaking down" to you didn't even mention you. It simply pointed out the origin of your previous post.
Wonderful that you shared something that resonated. If I found enough meaning and value in someone else's work to reprint it, I would also want to show my appreciation by asking for permission or at least giving credit.
This forum hasn't taken issue but wasn't previously informed as to the origin of the post in question. Being unaware of the circumstances surrounding an action is not the same as giving approval.
There are copyright laws that protect intellectual property and those violating them may be putting themselves and any message boards, blogs, etc. they post on at risk. IMO, at the very least there is a moral and ethical duty to give credit unless permission to use without it has been given by the author.