Clinton performed very poorly in the debates and that had nothing to do with her gender. She struggled with her messaging throughout the campaign and it is not surprising that divorced from the actual performance aspect of the debates, this messaging was ineffective. Hand-waving a "flawed experiment" away is bizarre.
What you call "bizarre" has been the scientific standard for a century. The experiment is categorically worthless.
We also have a name for the phenomenon of people latching on to anything that confirms their priors, by the way.