I think my mum's attitude to it when I was growing up may have influenced me. I strongly remember as a tween seeing her resentfully slapping our lunches together late at night. She was tired, sighing and over it and it was just yet another chore to do before she could collapse into bed (she had 3 kids and worked as a cleaner as well).
So I always resolved that my hubby is perfectly capable of making his own and he doesn't make mine for me soooooo that's that. I have enough on my plate never mind making lunches at the end of a long day too.
I have no problem taking care of all other aspects of the household duties even though I work part time too but for some reason I dig my toes in on that one! I even bake home made bread for him every couple of days as he is on a special diet to control his auto-immune disease so it's not like he's neglected or anything.
How about you?