The system, on context, clearly refers to the world of education and technology as a whole.

In fact, there doesn't need to be an explicit bad actor to have detrimental systemic effects. Just a long slow build up of bias. Like the idea, worked into our heads from a young age, that boys are better at science.

The key word here is "seems" and it only "seems so actively hostile" -to them- themselves. I don't think any impartial outside observer would say your average privileged white dude had an "actively hostile" environment at Google (or, indeed, almost anywhere else.)