I just thought, let's flip it around.

This is how you best determine the presence of gender bigotry.

Take the genders in contention, and swap them. If the skit or saying or phrase or whatever no longer “reads” exactly the same as it did before, then the “inoffensive” version is nothing more than gender bigotry being aggressively whitewashed.

Example: “kill all men” ↔ “kill all women”. Do both sides read the same? Are both sides taken to be “equally offensive” by most of society? No? Congrats, you have correctly identified the left hand side - frequently lobbed about by a majority of female supremacists as “a joke” - as being a whitewashed example of gender bigotry. And mercy upon the soul of anyone who utters the right-hand version, such is the severity of how offensive society sees it as.

I can shave myself for pennies versus what I used to pay them for disposable blades.

Safety razor, FTW. Blades are cheap, I can shave myself daily for five years for the same price as a 16-pack of replaceable Gillette razor heads that barely last me six months with only thrice-weekly use. And I have a straightedge for dealing with neck hairs during the winter when I let my beard grow out, works wonders in giving me a clean edge to my beardline. If I take care of it well, I could pass that straightedge down to one of my grandnephews in near-mint condition.