He doesn't say that you should go in and make fun of the newbies. He's saying that you should not complain about somebody who is playing better than you. You should try and become better so that you can beat him, who was above you.
When you say that somebody shouldn't go in and beat everybody, then you're saying that he should just not play as well. When you get beaten, there are two things you can do. You can think about how you lost and how he beat you and learn from it, or you can complain about the other player and quit. You can become better at fighting games, even when you lose every damn time. ESPECIALLY if you're playing somebody better than you. Hell, I've learned combos and techniques JUST from playing with other people. Didn't even talk with them. And those other people weren't just BORN with the knowledge of the game engraved into their brain. They learned it too.
When you say that somebody shouldn't go in and beat everybody, then you're saying that he should just not play as well. When you get beaten, there are two things you can do. You can think about how you lost and how he beat you and learn from it, or you can complain about the other player and quit. You can become better at fighting games, even when you lose every damn time. ESPECIALLY if you're playing somebody better than you. Hell, I've learned combos and techniques JUST from playing with other people. Didn't even talk with them. And those other people weren't just BORN with the knowledge of the game engraved into their brain. They learned it too.