Though this new friendship between Dipper and Ford can lead to some bad outcomes (namely, the twins getting split up) and yes, the idea does scare me, I still think that this relationship is very important to Dipper.
And I think this one line he said summarizes it perfectly.
Being a kid that grew up with some nerdy interests, I can see what he means by that, and what Ford means to him.
He’s used to being teased by everyone because of his interests; even by his closest loved ones. And while that teasing is not mean-spirited or meant to harm him, mind you, it still affects him.
Not only when it comes to the DDamD game, but with everything else. Dipper is constantly teased by Stan and Mabel in a way that other characters on the show aren’t; usually, for the way he acts, his interest in mysteries and books, even his voice.
It makes him feel silly for liking what he likes and being what he is, most of all; and to a growing kid, especially, that’s not good at all.
And then comes Ford, who is like him in so many ways. Not only that, but he also is an older, genius figure, one he has idolized and looked up to ever since he found the first journal.
And who, big shocker, actually respects what he likes.
Up until now, I don’t think that anyone truly validated his interests, not like Ford did. He probably feels like he’s finally found someone who he can share with what’s a big part of himself, one that he’s not able to share with most people; someone who just understands.
And really, Dipper needed it. All kids need this.