There seem to be a few classic stories that have been spun:
- that a gender imbalance in students or employees automatically implies sexism
- that being casual about sex is automatically sexist
- that not favoring a feminine, talkative, consensus-first working style is sexist
- that women deciding to leave tech means they are being "chased out"
I don't find any of these arguments particularly convincing. It seems like misogyny usually just means "something a woman hates" as opposed to actual overt discrimination and mistreatment.
What you may be referring to from the early 2010s is that a few activists of the Adria Richards type found that all they had to do was cry sexism, and a bunch of naive geeks stood ready to self flaggelate about how sexist all the other men were, but not them, no no no.
Which of course means that tech is not particularly sexist at all, certainly not compared to media or finance.
If there is one thing that is unabashedly sexist, it's western feminism, which has had 50 years to show its homework, and has revealed itself to not be interested in gender equality, but only in advancing female interests and positing women's rights, preferences and working styles as superior to those of men.
Strangely, despite this long track record, feminists still haven't realized that they are the status quo and they do everything they can to maintain a monopoly on gender discussions and issues. The use of words like "reactionary" is meant to emphasize this: that anyone who does not agree with them is trying to go backwards. But this is a lie, because despite their "gender studies" we understand men and women worse than ever before. Many of these same activists now even refuse to define what a woman actually is, but they are all sure that women have it worse. Funny that.