Hell I'm not talking about any INFJs up here on this forum.
And yes, INFJs I've got to know in my life are lovely people.
Sure they do have their negative sides, but which type doesn't? I've seen people saying that they hate the INFJs they know in their lives for them being double standard, stubborn, selfish and in denial about it, egoistic, passive aggressive, so on so forth. But I have met INFPs, ENFPs, xSFPs, and other types with the exact issues.
I myself did the test several years ago and got INFJ as a result.
One thing I know about INFJs that differentiate them from INFPs is that they have much more discipline than us. But they are similar in ways that they are sensitive, vulnerable, so much that being aggressive and doorslamming people is what they do to protect themselves from getting hurt beyond repair. Also similar to INFPs, they have some very very strong personal values that they are not willing to share with or explain to just anyone. Affection, love, care and compromise are exclusive.
Of course assholes come from any type. Personally, I just feel that INFJs can be easily misunderstood and unhealthy INFJs are definitely not easy to deal with.