There is a difference between saying a species is "biologically programmed" and a sex is "biologically programmed". And I think there is also a difference between the things we say turtles are "biologically programmed" to do and the things we say men and women are "biologically programmed" to do. It is a lot more accurate to say that turtles are biologically programmed to eat a certain diet than to say men are better at Y and women are better at X because genetics and culture are so intertwined that it is difficult to accurately say which is which.

Is it always sexist to claim biological determinism? No, but I think it would be good to acknowledge that in many cases we really don't know what is nature and what is nurture.