According to him, I'm a nuub and I've never defeated feldfeld and berhudar haha.
My winrate against any of the top players is over 80%, looking at the whole history.
Berhudar in recent history defeated me 75% because he used alt click, and I didn't even know what that was, but in all history, I lost count of how many times I defeated him.
Geriatrix basically talks this nonsense because he's not good enough, and he's jealous of good players. He says he won't play with me, but I must have like 50 replays against him, and he begged to play with me every time (of course he lost 99%), I even banned him from my games for a long time for talking nonsense, and he begged to join my games haha.
I think he is Physics (original acc).
About the pro-gui, it doesn't influence anything, if you are bad, you will continue to be. I have never used it, and I am sure it would not make me better.