You first argue that it isn't sexism, because 'men' may be used in a gender neutral way. Then you continue to argue that 'it is an artifact from a different time', which is a way of explaining the fact that it is sexist.
I fully agree that it is an artifact from a different time. It wasn't considered to be sexist at the time and it wasn't intended to be sexist, but from todays point of view, it's definititely sexist.
It's interesting how our minds work alike in the same wrong ways, because I had pretty much the same train of thought.