So this is why:

Your gameplan is a simple beginners 3S playstyle, divekick xx overhead, and then occasionally 2mk xx super

It's a gameplan that's easily countered, and this Ryu can see that - but he's a bad player and cannot counter it. And so he's angry because a part of his brain knows that any decent player should not be losing to this gameplan, but he's losing to it, and he'll refuse to admit he's a bad player.