I'm not trying to criticism this taunt for no reason. I love all the parts that made use of the personalities of each classes and even their outfits.
However, among the unused high-five failed animations, there was one where the demoman flip off.
Of course, that's not why it shouldn't be added to the game. I just wanted to say that I think this item will be less likely to be added to the game.
Anyway, nice work! Seriously, I really like how well animated it is.