My theory: INTPs (and similar types) are at odds with the general character of most society. Maybe only the T is generally accepted. Hell, look at job listings: they want people-persons that are detail-oriented and organized. Screw that!
INFPs probably have it worse.
Well, sorta. Probably male infps have it worse, then again, perhaps being accepted by society is vastly overrated.
On the subject of INFP adjustment to the world, and specifically of gender-based differences among INFPs:
In my previous post, just above this one, I mentioned that as an INFP male I dealt with the world's demands on me by adapting to the point of overcompensating. Interestingly, I haven't found many other INFP males who share my approach to life and/or who took the overcompensation route, especially on INFP message boards. But that may be a generational thing. I'm pretty old-school, whereas Internet message boards tend to attract a much younger crowd.
To engage in a gross overgeneralization, it seems to me like a lot of male INFPs take the "sensitive dude" route. That route is more of an option today for the younger generation than for me in the 1960s, I suppose. But it seems to me that those "sensitive dude" male INFPs aren't being challenged enough. They simply give up and quit trying to fit into the mainstream, and as a result they carry around a lot of resentment because they feel that they are a square peg trying to fit into a world that rewards round pegs; and then their fate is sealed when they learn about MBTI and get validated in the view that the rat race mainstream is somehow inimical to their nature.
I get into a funny dynamic with other INFP males. They aspire to be philosophers, spritual prophets, hermits, social activists, etc., and they accuse me of selling out when I describe how I've adapted to the rat race. But from my point of view, they're the ones who sold out. They don't even try to get outside their comfort zone; I don't give them points for merely excelling at what comes natural and easy to them; and I don't see that they're particularly happy or well-adjusted for having taken that route. They continue to chafe at always being outside the mainstream, and sometimes the insularity of their viewpoints has disastrous consequences.
But again, I'm overgeneralizing greatly. In real life, there's a lot of gray area. I've seen a lot of depressed male INFPs who rant and rail at the cruel world that won't appreciate them at their worth; but I've also seen well-adjusted male INFPs who made the "sensitive dude" route work for them; they establish a solid base from that self-view and expand out into the world at their leisure.
Overall, though, I tend to resonate better with female INFPs. (Again: overgeneralization alert!) The "feminine" INFP profile is a good match for traditional female roles in the world, so female INFPs tend to fit well within the mainstream and find their place in the world without a lot of conflict and rejection. But at the same time they sometimes fit into the world so neatly that they end up feeling imprisoned by everyone's expectations, like a bird in a gilded cage. So when you dig beneath their surface, you find that these content, quiet, peaceful little angels are harboring secret dreams of depravity, destruction, and death. They're at peace with the outside world and generally appreciate the rewards and comforts of the rat race, but there's also an iconoclastic streak just waiting to bust out and overturn the apple cart when everyone least expects it.
That's actually not so far from my own viewpoint: Go with the mainstream flow and excel at what you do, but also give the world the finger and go your own way after business hours.
To me, the INFP profile is
not necessarily or automatically about being sensitive, or being politically correct, or being spiritual, or engaging in social activism. It's more about exploration, originality, testing the limits (at both the spiritual and profane extremes), or just engaging in some good old silly fun. The typical young male INFPs seem to lose track of that second definition when they choose to remain outside the mainstream and go with the "sensitive dude" role--they get tracked into holding themselves up to a high standard if only to justify and substantiate the "nice guy" role they've chosen. The female INFPs, on the other hand, haven't had to make a choice of what role they'll play. They have fallen neatly and naturally into an easy role that's well within the mainstream, but after a while they start wondering if they're missing out on life and start chafing to bust out and explore life in all its complexity.
Disclaimer: Again, these are gross overgeneralizations and personal impressions. Also, there are generational factors that affect things. For example, the descriptions of INFP females are based mostly on my wife and other middle-age INFP females. Younger INFP females may or may not recognize that portrayal in themselves.
But the issue was raised of INFP adjustment to the world, and also of gender-based differences. I thought I would give my own impressions at the risk of irritating every INFP who isn't a perfect fit for my descriptions (which is pretty much all INFPs

).
FL