Ah, yes, I know well the INFJs. I'm not one, just for the record.

I'm not huge on typology, but from my observations, INFJs can come off as rather pretentious what with the whole "special unicorn-ness" of being labelled as the most rare personality type. Unhealthy INFJs, especially, can look a lot like narcissists. They tend to hold themselves to impossibly high standards, are extremely sensitive to criticism such that they view constructive criticism as a personal attack, become paranoid about whether or not people like them, among other things.

But even unhealthy INFJs that I've known still had a lot of empathy for others.