[natch]

The real world is just not as simple as your bimodal stance.

First off, sexist environments do exist. So that alone should invalidate how you think of this as either competence versus whining. Also, there are varying degrees of sexism, including places where it is not present at all. How can we know this? Zipf's law. Or by just doing a thought experiment, which I'll leave out here (just think about the simplest possible workplace).

On the issue of technical skills, everyone is incompetent at something. Even if you are highly technically skilled in your chosen field, these days almost every field has overlap, including new and emerging areas of overlap, with other fields including new fields. There are also new techniques being developed all the time. Everyone is learning on the job, and that's as it should be. Does that mean it's OK to whine about non-existent sexism? No, but does it mean that sexism does not exist? Also no. And if it does, it should be called out, regardless of whether someone is a Nobel laureate or a student.

Going to the extreme, if you're not at all skilled in any field but are just learning, that doesn't mean that speaking up about sexism is just whining about imagined problems in every case.

I have no doubt that some of what you're talking about is going on. But my point is it just doesn't begin to explain the whole picture.