My older brother is the reason that I got into "nerd culture" since I read his sci-fi books as a kid as well as his comic books before I started collecting my own. Also, before he got too old for it we watched G.I. Joe religiously (imagine that cartoon on today). He a wife and three kids now so he is out of the loop for a lot of geek stuff, so when I told him that Amazon was going to have a Lord of the Ring show we both got a good laugh because the first thing he said was "so how long before the articles bashing Tolkien or whining about lack of diversity start"
It is so funny because with all the reboots/sequels I swear it is like clockwork to see articles from supposed life long fans of something that now "realize" all the racism/sexism in the original show/movie. I remember the gushing critic articles for Ghostbusters 2016 and it has only become worse since. I'm currently on the last book of Wheel of Time series and I've already seen articles calling it sexist and complaining about abuse to women. That whole Geeker Gate thing was spot on.
I'm not surprised your older brother sees it. What I'm worried about is that it seems like the young Gen Z types *don't see it and more or less accept it as part of their "normal" the same way they accept the Internet and smartphones. They were born when it was already established - there was no era they can reference themselves to like us older millennial/Gen X types do.
That lack of reference makes them way more susceptible to dumb fucking ideas like "gender is a social construct".