My best friend is an ENTJ, and we get along wonderfully, even when we disagree. She stays very engaged in our friendship, I feel like when I'm talking to her, that she's listening and taking in what I'm saying, so she can then give her opinion. And we can both be blunt with each other, which I really value. I don't have to pretty up what I'm saying to her, because it's understood that the things we say to each other, even if it's not what the other person wants to hear, it's spoken out of genuine concern. We can disagree because it's not the end of the world.