That's an interesting observation. To be honest, when I read
Fidelia's list of how to successfully interact above, I felt a kind of despair of being able to interact positively with INFJs over time. I'm not going to be absolutely consistent over time; I've gotten better about being more consistent as I've gotten older, but it remains a real balancing act for me. It's a little like trying to step on a lump in the carpet.
I certainly feel like I also tend to bow out of threads if they become too unpleasantly conflict-laden. At times I've avoided the majority of the forum, because of the level of ongoing vitriol. I feel like it's been less bad of late generally, but it does seem like more than a couple of INFJs feel themselves to be particularly picked-upon as a group. It would be a positive thing if real discussions could happen without people feeling unfairly singled out (either as individuals or as a group). Still, being human means that some level of miscommunication and irritation is going to happen some percentage of time.
As far as kryptonite, I feel like I can tend to be "future blind" in a particularly kind of way, in that I can tend to avoid seeing the outcome of events as inevitable. I also tend to be bad at seeing long term subtle trends across interactions and contexts. I think the up site for Perceivers is being more aware of the "instantaneous momentum," and being able to tune in accordance with that perception.
Conversely, I feel like INFJs have a much better handle on the momentum of relationships and interactions (both with individuals and groups). However, I think they struggle more with moment to moment variations.
Sometimes I get the sense the INFJs experience themselves as each piloting tiny, unstable boats across a deep and mysterious sea. To make matters worse, each person has a storm waiting to be released within. The INFJs therefore want their own storms contained (both for themselves and others on the waters), and want neighbors upon the water who are willing to do likewise. They want neighbors who can help fish them out of the water when they capsize, and get them dried and on course as soon as may be.
INFPs, on the other hand, tend to be swimming around in the driving rain remarking to those within earshot, "Swimming in a storm is awesome! Don't you just LOVE a good storm?!?" I fear it comes across as total madness to the INFJs.
[As an aside, the advice for INFP growth isn't too dissimilar than the one for INFJ growth: one has to let reality and different perspectives in. It seems like we are two of the most idealistic types, but with differing visions of how to get to an ideal place. INFPs want each person to work toward their own goal and be respected for it, and then a chaotic but beautiful mosaic will emerge. INFJs seem to want everyone to harmoniously join forces to work toward a goal that will benefit all, creating a wondrous tapestry in which neighbor supports neighbor. (Wow, I think I need a healthy dose of cynicism after typing that paragraph. Ick!)]