The prefix affigo (pronunciation: /afˈfiː.ɡoː/) comes from the Latin for: I imprint on, I attach to.
Affigogender is a term for people who were raised with an assigned and imposed gender. They may choose to hold on to and live as that gender (which characterizes a cisgender person), or they may disagree with their gender assignment (which characterizes someone who can identify as transgender). 
The flag contains the following colors: black, symbolizing the mourning for bad things caused by the imposition of gender; blue and pink, representing the cisnormative and exorsexist/binarist imposition of gender; and white, a request for peace from gender assignment and imposition.
Term created in 2016 by Rexistencia Não Binária (Nonbinary RExistence, a Brazilian collective).
So, this is for those who have had a gender that was both assigned legally and enforced by their parents, family, friends, school, etc.
"For those confused: this does apply to most people, but the growing rate of proper gender-neutral parenting without an assigned gender has made this refreshingly less common, though most anyone old enough to be on deviantart were most likely not raised this way.
So, this is for those who have had a gender that was both assigned legally and enforced by their parents, family, friends, school, etc."
This was made as a set along with accipiogender [Link], which I haven't uploaded yet since I don't have a HQ version yet.
I'm not sure how useful these terms will be but might as well upload them anyway
Does that make more sense?
Almost everyone is *medically/legally* assigned a gender at birth based on their genitalia, or in the case of intersex children, by whatever genitalia theirs resembles the most, or just arbitrarily chosen for them. Most children are raised *socially* in correspondence with this medical assignment- their legally assigned gender is also imposed on them by whoever is raising them. Their parents will use certain pronouns and gender terms from birth as opposed to waiting for the child to be old enough to understand and express what gender(s) they actually identify as. Most people would fit under this term/flag, as it is a harmful practice that is only now beginning to change with gender-neutral parenting. This term is meant to acknowledge the hardships associated with having a gender imposed upon you by your parents, which nearly all of us have gone through.
Nowadays, some parents choose to raise their children gender-neutrally, as opposed to how most of us have been raised. Gender-neutrally raised kids have had their parents use they/them from birth until the child expresses their own pronoun preference, and their parents would not call them a boy or girl or use gendered language on them until the child indicated a preference.
In short, this term refers to those who had their parents go "well this kid has been medically assigned female/male based off of their sex characteristics, so I'm going to raise them as female/male and make them adhere to whatever gender roles I associate with that gender." In all likelihood, you were raised this way. I was. It hurt me a lot. I'm glad that some kids are being spared that experience now as society changes and parents actually let kids express their feelings freely without having already been put into a box based off of their bodies.
I do understand having gender roles imposed on you, that sucks.
They/them is just a neutral pronoun set. The only reasons a child might feel apprehensive about them is because of transphobia or because they prefer other pronouns, but they can always talk to their parents about this. Gender-neutral raising parents aren't going to care if their kid talks to them about their gender feelings.
I think it's important to remember how different the entire experience would be being raised neutrally with supportive parents.
Also, using pronouns based on genitalia is cissexist. Anything implying "penis = he" is something that needs to be removed from social constructs. There's nothing different or weird about they/them compared to any other pronouns, especially if the kid is raised knowing that all pronouns are equally valid. This is a child raised in a non-transphobic environment, they/them is normal to them.
I may be wrong, however.