Had George raised his son, he likely would have snatched the boy up by the scruff of his collar and drug him back to the apartment where Winona was waiting. Then he would have forced Jim to apologize and more than likely let him know exactly what was in store for him if he ever dared speak in such a way to his mother again. However George didn't raise his son, hadn't been around for any of the things that a father should be there for, and a complete monster by the name of Frank had all but ensured that any attempt to accost Jim in a fatherly manner would be misconstrued as much, much worse.
So he didn't reach out to throttle the teen or even step within his personal space. He simply stood there, arms clasped behind his back, with a look on his face that would likely be all but unreadable to Jim considering George wasn't even sure how he felt, much less how to let his expression relate.
He said nothing for a few moments, instead waiting to see if Jim would try to bolt. When it became obvious that he wasn't going to do that, George finally decided it was time to speak. And while he wanted nothing more than to say something in regards to how Jim had been acting, especially how he'd reacted to Winona (and himself, although that stung far less than seeing his wife so upset), instead he said something that he'd had to write before when he'd first encountered his then-grown son more than a month ago. Albeit a slightly altered version, to suit the situation a bit better.
"I'm not going to take up much of your time since it's clear you have plans," he began, his tone soft and even. "I'm also not going to lecture you on the way you should behave. At your age, you've either figured it out or you haven't and trying to step in where I'm clearly not wanted isn't going to solve a thing. I just want to tell you something and then you can be on your way to wherever it is your going." He paused, eyes shining with emotion as he said what he'd decided at the last minute needed to be said far more than any form of rebuke that he could think of.
"I love you, son, and I'm proud of the things you've accomplished. Growing up like you have, going through the things you have, you've still got a good head on your shoulders and you're not afraid to be your own person." There was a hint of amusement in his tone then, his brilliant blue eyes sparkling. "I may not agree with the things you say or the way you say them, but my father didn't agree with me either when I was your age. And no matter what you decide to do in the future, it doesn't matter. You're still my son and I will always love you and always be proud of who you are."