The sex/gender distinction of the 20th century and now deeply popular among LGBT+ circles in the 21st century was one step forwards, two steps backwards. Although it provides a simple "explanation" of trans people, it ultimately cements sex and thus patriarchy as the natural state of things. Human sex has always been a social concept with biological justifications applied retroactively and selectively. The proletarianization of women and advances in medical science lay bare the absurdity of sex and for the first time in human history create the conditions for the world-historical abolition of sex and male supremacy. As the proletarian revolution self-abolishes the proletariat, so too does the transsexual-feminist social revolution self-abolish the woman and transsexual. Down with cisgenderism!
They're different parts of speech (male/female can also be a noun, but usually only done by people like disconnected from the subjects they're describing, like cops and scientists). I mentioned that the graphic doesn't differentiate them as a positive about it FTR.
I've probably used it in times you'd probably think it was irrelevant as a way of avoiding making more specific claims. Easier to say what I'm not (which AMAB, imo, implies - I don't agree it implies you ever were the thing; just that others said you were).
Back when I was a lot more ignorant about gender/sex/etc, I liked those labels because it was clear what was meant. Given transphobes will say things like "we need to stop transmen from going into the women's bathroom" when they mean to exclude trans women, I was never 100% what was meant when they're used.
Now I'm not a fan of them because they feel like they exclude NBs (which usually is not intended) or those who don't medically transition.
My mom certainly isn't socialized as a girl. And she was AFAB and identifies as a woman (granted, her definition of "woman" is based 100% only on the bits she was born with). Socialization is certainly more complex than AGAB. It describes how people TRY to socialize with us. Was at a family gathering (these tend to be very woman-dominated) not long after realizing I was an egg and my cousin's BF tried to do guy talk with me (sports or something) and quickly got bored and went to chat with my mom instead. Just kinda funny seeing that gendered socialization expectations break down in such an obvious way.