No. My best friend is an ISTP. We don't have intellectual debates, I don't argue with him as sport (I couldn't really - there's a big gap between our levels of education). But we're very much friends and I'm pretty sure I could trust him with anything and hold him in very high regard, possibly even exactly because he's not an academic and doesn't do debates. There's nobody I'd rather spend time with.
What makes us click? I dunno. We just do. I guess we share notions of how people should treat each other, and feel that the other acts out those notions to a good degree. And we like adventuring, fixing/improving things and getting drunk and talking shit that we forget the next day. I guess, really, we're there for each other and there's no judging going on.
I think actually that's getting closer to it - the lack of judging. That's what makes me feel free with someone. With some people I feel like I have to always be sort of proving myself against whatever bias they have against me, and that's very draining. I feel like if I do something wrong, I'm being judged as a bad person, my worth as a human is dropping in their eyes. With my ISTP, if I do something wrong, well, it seems like he just has compassion - he's willing to believe first and foremost that it was an honest mistake and the last thing he'd think would be that I did it on purpose or with malice.
Yes - I feel free with him because he believes in my goodness as a person and trusts in it, and doesn't judge me. He sees the good with the bad and accepts both. I feel free to be human with him, and that means being myself. With people who I feel will judge me if I make mistakes, I feel like being human isn't good enough for them. Ergo, I can't be myself, because human is what I am.
The stuff I don't wanna talk about (personal stuff), he doesn't wanna know. And the stuff he doesn't wanna talk about, I don't ask. No need - it gets blurted out when drunk and then never spoken of again, and that's the way we like it. I feel like I have emotional privacy, if you get me? And that's important. With NF's, I sometimes feel like I'm being sort of "emotionally raped", if you get me?