asked: "Aren't you aware of the underlying reasons behind that aspect of the writing? The fact that it's basic social commentary on the fact that during these kinds of times in our own history, that kind of male view of women as mothers permeated throughout the public and political discourse? It isn't the writers saying ''Women are only good for being mothers''. It's the writers saying that's what men of this period seem to think. And they're dead wrong."
There is a way to reflect that the men have wrong attitudes, but in the case of that joke, it was portrayed as Tyrion being clever and funny. They were not indicating that Tyrion sucks for thinking that. That said, I would ignore it probably if it wasn’t part of a larger trend.