What is a colloquialism? Is it sexist?

Because it plays on a colloquialism?

You should check out his earlier series, Crimson Worlds. It is really good as a sci-fi book, and it is also a very fun read. The characters are real, and it really draws you into the world. It is a military sci-fi book that focuses on infantry combat, but expands to naval warfare, and then the political wars between…