Oh, you INTJs. Watching you guys disagree is sometimes like watching a ping pong match where each player catches the ball, stuffs it in their mouth and eats it, and starts playing with a new one altogether. "I reject your argument, and chose to attack you on some other point altogether!"
I'm likely going to regret saying that.
I've watched a couple of INTJs instantly assume they have a person's number (yes, in my case INTJ men who are annoyed with really chatty/animated girls) and greatly underestimate that person's competance and intelligence, making an ass of themselves in the end.
That said, while that can be a pitfall of any type who doesn't naturally come by stellar people skills, it's not really an INTJ trait, from what I've observed. The conclusion jumping and seeing people as two dimensional usually just means that the person lacks relational experience, or isn't asking the right questions to get to know them further.
It's silly to assume that because I person is talkative/bubbly/energetic vs. dry/reserved/serious that they're less intelligent or capable of making connections. Some of the most wildly intelligent people I know can prattle incessantly about minutia, only to blow me away with something really insightful and original when I really need to hear it.