Are you thinking of this person:
http://news.ycombinator.com/item?id=167383 ? I didn't say that.
Unless you're addressing an autistic audience, it is acceptable to say "Women do X" when you really mean "Women do X more frequently than non-women, although of course some women do not do X at all, some have never heard of X, some hate X, etc." For example, I am rarely corrected if I say "Five-year-olds are taller than four-year-olds," even though it's trivial to demonstrate that this isn't true. If your argument is that the statement in question is not literally true, you are correct. But if you use that to conclude that the tendency described does not exist, you're stretching things.
The statement was not "Women are nesting more than they used to," but "Women tend to nest." Whether they start nesting immediately or a bit later than they used to distracts from the point that they do it more than men regardless of timing.
>I know a lot of female professionals and I can't think of any without kids that spend any appreciable amount of time on handmade crafts.
I know female professionals who don't, female professionals who do, full-time parents who don't, and full-time parents who do. Perhaps, given your admittedly limited circle of acquaintances and your previous admission of bias, you should leave this discussion to people who have more data and less of an axe to grind. That is, you should do so if you want to know the facts -- if you want to defend your prejudices, proceed.