This phenomenon is difficult to describe precisely in words. That said:

The core of every complaint that expresses a general characterization of people or life always describes the complainant's childhood experience of either one or more people whose faces are imprinted or the emotional environment created by one or more of the people whose faces are printed.

The complainant must be experiencing category 1 emotion when making the complaint (in other words, they must be complaining and not making intellectual statements/observations). Sometimes people use words that sound like a complaint when they are actually calmly describing a person or situation without complaining. At other times, people repeat what other people have said. In these cases, the language may not describe that person's childhood experience.

Here are some examples that illustrate what I mean:

People who say, "People don't accept me for who I am" will likely think that someone in their childhood whose face is imprinted didn't accept them for who they were. If I ask, "Who didn't accept you for who you were when you were a child?" I'd likely hear the name of someone whose face is imprinted.

People who say "She only thinks about herself" will likely think that someone in their childhood whose face is imprinted only thought about themselves. If I ask, "Who in your childhood only thought about themselves?" I'd likely hear the name of someone whose face is imprinted.

People who say "Things are beyond my control. It's like I'm just following a script" will likely think that during their childhood things seemed beyond their control and they felt like they were just following a script.

People who say "The world is a rotten place" will likely think that their childhood environment was a rotten place.

People who say "I am a prisoner to their agenda" will likely think that during their childhood they were prisoner to the agenda of one or more people whose faces are imprinted. If I ask, "Whose agenda were you a prisoner to when you were a child?" I'd likely hear the name of someone whose face is imprinted.

People who say "She is always invading my space" will likely think that someone in their childhood whose face is imprinted was frequently invading their space. If I ask, "Who in your childhood invaded your space?" I'd likely hear the name of someone whose face is imprinted.

People who say "He never listens to me" will likely think that someone in their childhood whose face is imprinted didn't listen to them. If I ask, "Who in your childhood didn't listen to you?" I'd likely hear the name of someone whose face is imprinted.

People who ask "Why do I feel like such a fraud?" will likely think that they felt like a fraud when they were children.

People who ask "Why do people always tell me what to do?" will likely think that someone in their childhood whose face is imprinted always/frequently told them what to do.

If the complainant's words are changed, the complainant may not agree that the complaint describes a person or situation from their childhood. For example, if the complainant says, "I live in a world where I don't belong," and someone says, "You felt like you weren't accepted when you were a child," the complainant may disagree. 

Sometimes people exaggerate their complaints such that the exaggerated words don't describe their childhood experience. In that case, they should be asked what they mean by the exaggerated words. Those words will likely describe their childhood experience. For example, if a complainant says "She's really screwed up!",  the complainant may not agree that anyone in their childhood was "really screwed up." If asked what "really screwed up" means to the complainant, she might say, "She only thinks about herself." In that case, the complainant will most likely say that someone in their childhood whose face is imprinted only thought about him/herself.

A complaint about a female may be a complaint about a male whose face is imprinted, and vice-versa.

Sometimes, people may think that some of their complaints don't describe any of the people whose faces are imprinted. There are multiple reasons for this. For example, the parent may have also treated the person very well and when the complainant thinks of that person (whose face is imprinted) only the positive thoughts and feelings arise. However, in every case, after weeks or months of looking at pictures of the people whose faces are imprinted, other memories will arise and they will realize that their complaint exactly describes someone whose face is imprinted.