So I read this first chapter, and whilst I found the representation of the male characters a little flanderised, it is still VERY accurate to what a lot of males have said about females in "their" territory.
I then read some of the LN's first volume, and BOY does the author lean in hard on real life occurrences.
Yes, the stereotype in Japan of many female workers is that they are mere secretaries who are just their to look for a husband, will quit and stay at home to be a SAHM. Ergo, there is no point training them beyond being OLs, and any female wishing to be anything else is going against her nature. In a lot of the Western world, there are still male dominated fields where almost all the big wigs are male, and females who dare try to make a name for themselves are judged very harshly and or given barely any attention. In my field, it's not nearly as bad as in Japan (or this manga), but there is a sizeable minority if not plurality of males who hold similar opinions, and have said as such in a public space, and in writing.
Yes, there was actually a debacle where a Japanese university artificially reduced the grades of female applicants. Allegedly this occurs with Ivy Leagues with certain racial minorities as well, because those presently in power don't consider the merit of those minorities as being... well, meritorious enough.
Yes, there were businesses in Japan who insisted their female staff HAD to wear high heels, even if it was medically inadvisable. Makeup is also pushed a lot in many fields in the Western world, and dress codes are also quite a bit stricter on females, so don't try to pretend this isn't a thing outside of Japan.
In short, all the complaints about this being unrealistic sounds a whole lot like "I've never seen it happen, so clearly this doesn't happen". Given #MeToo, SURELY people are starting to realise that just maybe females experience life a little differently to males, or am I just hoping too much?
TL;DR If you think this series is an inaccurate representation of female experience, you're part of the problem