Just speaking for myself here:
I'm pretty patient if someone genuinely doesn't understand something. I would never hold someone's ignorance on a topic against them. There's plenty of stuff I don't know, either - there is no shame in not knowing something, but I have a low threshold for bullshit and little patience for fucknuttery --> willful ingorance.
The second part of your question - does it lead to attachments? I treat people as individuals, and I've learned how to get along with people I don't have much in common with, but in general, I prefer to be in the company of people who can carry on an interesting conversation that sparks my interest.
For me, there are different levels of friendship. There are some friends that I can meet with for lunch every once in a while and chat amiably about casual subjects (an occasional lunch hour is more than enough), and others whom I find engaging and love to sit around and talk with about topics that are a bit more abstract and that interest me.
Surely there's more to it than "don't be an idiot"? But then again, how do you define idiocy? And is this definition held by ENTJs in general, or is it more specific to your own personal perceptions? Not being an idiot might lead to a detached sense of respect for another person, and even towards the building of casual friendships; but does it lead to attachment as well? Do you grow very fond of every person you meet who happens to not be an idiot? And I'm genuinely interested in understanding here.