INTP's seem to very much underestimate the effect of emotion (their own and others) in decision-making. As a listener, when I hear something that makes my ears perk up, like that little sentence shared so kindly by herbpixie, I have found it useful to take a step back and clarify what the message really is before jumping to defend. Sometimes that defuses it too ... when an INTP realizes their little snarky "comment" didn't go unnoticed ..... and may now cause a social problem.
When they hit their forties, many INTP's seem to be really exploring Fe, IME. My brother is a fine example of it; you'd think this "people stuff" was a whole new world ... He even called my Mom for Mother's Day this year ... what a shock!