I'm trying to think of an NF I've known IRL that I really disliked. Even the ones I ended up disliking I often like enough to get to know to a point .
I can think of one INFP I disliked, who was too passive, self-absorbed, and elitist. Two ENFPs who lie for attention. One ENFJ who gives off that creepy cult leader vibe & who has a massive ego. One INFJ who has displays the personality of a rock unless he's known you for 10+ years.
I can see myself in varying degrees of all of those traits too, except the lying.
In general, NFs can be too diplomatic to the point where you don't even know where they stand on something, can have elitist attitudes, are occasionally self-righteous, can be so insightful with other people and yet have a big blind spot on what to do in their own life, romanticize depression & flaws, won't act until something is "ideal", latch onto impractical ideas, etc.....but honestly, those flaws don't bug me as much as general flaws in other types...maybe because I "understand" them more.
Things I dislike about myself in particular is being moody/grouchy, always needing to be authentic & fighting the tide (I'm working on just.letting.it.go), being too sensitive/defensive, very critical & easily disappointed, being such a weirdo, etc. Most things I dislike about myself are related more to shyness though, not NFness. I kind of love the flipside of my "NF flaws", as negative tends to be the other side of the positives.