Sound like working class or agrarian stereotyping to me. My late father-in-law couldn't stand me because in his eyes I never worked a day in my life. I sat in chair behind a desk and played tiddly winks all day as I stared at my diploma on the wall as far as he was concerned.
So much work that a lot of men do is routine, even outside desk jobs like programming, writing, and management. My next door neighbor works for a dairy. He loads the same crates onto the same truck, drives the crates to the same stores, and unloads them every day. The joke is that he's asian, and can't even drink milk.
It isn't, the description may have been inadequate, but it wasn't meant to describe only physical work, it's just quicker and easier to use that.
Even when it comes to pushing a pencil, I think that the most routine, repetitious chores drift towards the women.
I have done route sales and deliveries, it is fun, and I find that vastly superior than daily house work, and the never changing routines of the daily family, house hold routine as listed at the top of the page.
Why is him being Asian a joke?
/sarc