I think you're guilty of tarring that whole movement with the same brush. You can't seriously believe that whole movement is crammed with people who ALL think the armed forces are thick and stupid? Clearly it isn't.
That said, I don't see the point of any of it. Get into power, then scale...
I can't say I approve of these jokes at the expense of the army because they are crass, open to criticism, and of course can easily be offensive to those who have given up the most, but that article is nothing if not completely bias. It barely pays lip service to the other side of the argument...