"However, for some on here, it is far easier to refer everyone to Cordelia Fine and assert (with very little evidence) that gender is entirely a social construct "
But neither Cordelia Fine nor feminists in general believe gender (in the sense that you mean here: the existence of behavioural differences between the sexes) is entirely a social construct.
That is what you would like us to think so you can see us as militant and dogmatic and therefore dismiss our arguments.
FYI this is is what Cordelia Fine actually says:
"my perspective is one in which the developmental path is constructed, step by step, out of the continuous and dynamic interaction between brain, genes and environment"
The continuous and dynamic interaction between brain, genes and environment? A nuanced and complex picture isn't it?
And whilst there is not much we can do about genes there is an awful lot we can do about the environment and - as it's increasingly turning out to be the case- the brain.