I'm a lady and haven't had any trouble here. The only place I really notice how ridiculously male - skewed Lemmy is, is on the NSFW. That is definitely all "male gaze" stuff, with the occasional actual lesbian also posting stuff guys like. Even the posts OF men are FOR men, everything posted with some assumption only men are looking at the posts.
The other communities just aren't so gendered, I don't notice much whether someone seems to be one or the other, it isn't relevant to cocktails or cooking or gardening or science fiction.
I don't think of selective gene editing of one person as eugenics and do think we will get that, we have some versions of it for born people already. Editing it out of humanity? No that's probably a bad idea. One of my kids works in genetics and was horrified when I joked about her making designer babies like in Gattaca, so I don't think science thinks it a good idea. Push on one thing, another pops up.
You might enjoy Octavia Butler's Xenogenesis and Patternist books, if you like thinking about this stuff.