I don't even really understand that concept of someone being 'smart' or someone else being 'smarter. ' I think that except for the obvious special cases, we're all equal.
The universal basis for the categorisation 'woman' will, no doubt, be constantly shifting but it is important not to deny it's existence altogether. There is a partly biological basis for this identification. The 'nature' of woman may be conceptualised in the early Greek sense of a force or a power, in its turn shaped by forces outside it, rather than in terms of some set of properties.