It is no more 'recently invented' than autism, veganism and other things that make some people feel uncomfortable. Ideas about it began to come to the fore in the 1960s. But there has been a great deal of pushback.
From people like you who don't understand it or want to understand it, but feel...
You are right. Gender labeling is a social construct, but gender is an innate characteristic that manifests on a continuous scale. Depending on what you use to measure gender, I'd bet that humans are mostly non-binary. Without going into details, we can all list characteristics that we'd lable...
I salute your indefatigability. Woody is the only person I ever put on ignore (once) for merely posting stupid. After a while I relented, recalling his good honest support for Brighton, and general good sense (after all). However, when stupidity underpins nasty prejudice then one has to call out...