I'm not sure you do understand. The point is rather, "yes, it is rude and aggressively forward. Added onto that, the fact that someone felt free to do it, is sexism. And, the global environment that it creates is also sexism."
It is a sexist request in the sense that it was constructed by, and constructs, sexism. It does not directly oppress anyone, that is true -- but that is irrelevant, because that isn't the only mechanism of sexism (and isn't even the dominant mechanism).
As long as we are agreeing that it is <what ever> regardless of who does it, I really don't care what you label it. That was my point. You can believe it is sexism. I will believe it is not. I don't have to believe it is sexism to think the behavior is bad. It is bad regardless. However, I believe labeling it as sexism is overly harsh due to what that label implies. I don't believe that label is deserved.
It is a sexist request in the sense that it was constructed by, and constructs, sexism. It does not directly oppress anyone, that is true -- but that is irrelevant, because that isn't the only mechanism of sexism (and isn't even the dominant mechanism).