Well, the main issue is it doesn't address the correct elements.
1 - Your first recourse is to say others have used gifs and nothing else - in an attempt to discredit my accusation, you attempt to establish my position as one where I say those things are fine. It's obviously not my position, but I can't read into someone using gifs, I can read into someone attempting to talk about the game.
2 - Your last post is to insinuate that as scum, you'd also just post gifs to blend in - I don't believe you think this is an accurate depiction of your approach to scum.
3 - Your focus is on attacking the reasoning behind it, and you also use recent games (I can think of only one, where I was scum) as a means to discredit the line of accusation. The reasoning is obviously going to be weak, it's the motivation that's important here, and I haven't seen any indication that you've considered this.
In short, it's defensive, unduly so, and is more manipulative than genuine because of how its constructed.