Even if you had told him, he wouldn't have changed anything. He's that stubborn and immature.
What blows me away, despite how familiar I am with this fact, is how age simply has not improved him at all. I... just don't see that others. Ever. The worst people I've dealt with were either crazier than him, because of drugs usually, or just had more of a spine, and therefore went outside and made more of a mess.
But everybody else, who is simply flawed, manages to at least accidentally grow up a bit. It may take until 30, but it happens. Phil reached his teens years and stopped there. That's why he doesn't look at his early days on YT and pick up on the fact that he wasn't supposed to be so immature then, because he just doesn't know that being 27 means knowing how to do your own fucking laundry. And not throwing a fit when people make fun of you for it.
Phil gets every bit as pissy today as he did back when people gave him shit over his posts on the Shoryuken forums. He puts in just as little effort, expects just as much reward, and acts just as shitty towards those close to him. Time touches his body, but not his mind. It defies comprehension.