So because two terms were created to coincide with two genders, that somehow invalidates them for being a “social construct?”
No it doesn't invalidate them, and I never said that.
Most people who consider themselves "men" are biologically XY. Most people who consider themselves "women" are biologically XX. That's a fact: people whose perceived gender aligns with their genes are overwhelmingly in the majority.
But
some people are different. Some people have XY genes but are women; some people have XX genes but are men. Some people have XY genes but are born with completely female genetalia. Some people have XXY genes, some have XYY, some have both XX and XY and it varies from cell to cell!
Sex is in the genes, gender is in the brain. Unless you're someone's medical provider it isn't any of your business what's going on with their genes. Either way there are more than just two options. Biology is messy.
I’m still trying to keep track of all the different genders, orientations and pronouns that trannies have come up with in just the last several years… but I suppose that has absolutely nothing to do with any of this. 👀
Yeah it can be confusing if it isn't something you grew up learning, which it isn't for most of us. Personally I agree with your position that a lot of the Tumblr-era neo-pronouns like "zir" or "xim" are just young folks who are exploring new ways of expressing themselves and trying to be different from everyone else... but it isn't really my place to police them. If someone says "My pronouns are xe/xem/xes" then that's what they are; after all, what someone calls themselves
is their name, ipso facto.
Look at Trump's VP candidate. His name is James Donald Bowman. Oh wait, no, he changed it; his name is James David Hamel. Oh, nope, actually his name is James David Vance, but he'd prefer it if we called him JD Vance. We respect his right to refer to himself in the way that feels best for him, so we call him JD Vance now.
But putting that aside I don't think you're arguing from a position of good faith about the pronouns. In the real world you're most likely to encounter "he" or "she" or "them." We already use each one of those as personal pronouns so it isn't very much to ask of you.