Is it true that women make better sandwich's than men?

Jerry, this isn't always true.  I did do the most food making in our household, until Lockdown ensured that my male other half, worked at home, whilst I worked outside the home as a Front Line Essential worker.  Now he makes most of the meals, however even before Covid, he was a better sandwich maker than me.  Though I make better lunches, ie picking Spring greens, such as wild Garlic leaves, Chives and other herbs to add to omlettes or salads with grated carrots, apples, lettuce etc...  He always added pickles or mayo to sandwiches, rather than my bog standard cheese etc, I was better with the side additions!

It's a joke and a way to piss women off that are offended by men that want anything traditional of women. 

Yes...practice makes perfect.

Ironically, the best chefs are men.

Only if you're looking to follow the recommended serving size on the package of cold cuts. If you want a Scooby Doo sized pile of meat you'll probably want to make that yourself. Women tend to be more practical about eating and health. 

It's true

that people who have more practice making sandwiches

and who make an effort to produce better sandwiches

make better sandwiches than do others.

In most households

and especially in traditional households

that means that the woman is typically much better at making a sandwich than is the man.

Not in my experience, then again my wife isn't about to make me a sandwich. Thank god she pretty much stays out of the kitchen too.

Some do, some don't.  

But at least most women know how to spell a plural - they don't take apostrophes.  

It's 'sandwiches'.

Women don't make sandwiches anymore. They call doordash.