Looking at the time stamps, you posted at 10:17, I replied asking for a source three minutes later at 10:20 and then you edited the post at 10:24. Even the image you posted has a 7 minute gap between your initial post and the edit. So no, not immediately after and yes it was after I asked where you got the image from. (Which you still have not said, someone else had to do that for you.)
And no, that is not a fake image anymore than a piece of fanart would be fake. Fake implies deception, that it was being passed off as real, while the artist was open with what the image was. It only becomes deceptive when it's posted without context, as you did. Which, again, is a reason you should source your images.
You made a mistake and there's nothing wrong with that, so long as you learn from it. Sourcing images and information is important, for the reasons I've given and more. For instance, anyone who thought that was a good digibash and would like to know who made it, and possibly check out more of their owrk, would have been completely out of luck. Sucks for the guy who put the work into making that image.
I'm not sure why you feel the need to get overly obstinant over some mild criticism. I don't know if you having a bad day or what, but maybe take a step back and reevaluate what your doing and why.