I suggest the "propensity to put everyone into neat little boxes" is the direct result of the way human intelligence works. In every field, including natural science, the intellectual urge is to make distinctions founded in data, and use those distinctions as our understanding of the world.

I further suggest that we see exactly the same propensity to discover "neat little boxes" in emerging gender theories. Just now the field is a bit of a mess, in the sense that everyone and his dog is proposing new distinctions from diverse perspectives. This mess is not bad, but perfectly natural as the human mind struggles to make sense of new data, new observations.

Our Catholic problem is somewhat different, I suggest. There is a powerful tendency to sanctify prior sets of "neat little boxes" rather than be open to new one, based on the false assumption that those prior boxes have been with us from the beginning. Doctrine has always changed, and that crucial fact was not taught in seminaries.