Laundry crisis

It doesn't happen very often, but once every few months it occurs at the M & Nic household: the laundry crisis. With that I don't mean the bleeding of a red sock in a white load of laundry. I mean the fact that M and I argue over laundry.

When we first moved in together, we discussed the house work and how we would divide it. We made an agreement: M promised to take care of the floors (vacuum and mop) and I would do the laundry.
This arrangement has worked well so far, but sometimes I get annoyed. I'll explain why.

We have one dirty clothes basket, and on Saturday I sort it. I make piles: a dark load, a white load, a red and pink load... it totally makes sense. I throw them in the waching machine and until that time there's piles on the utility room floor. Sometimes that means that when M comes out of the shower on Saturday night, he has to put his dirty clothes somewhere. However, he doesn't seem to understand the system. To me it's logical that his dark socks go on the dark pile, and his white undershirt should end up on the stack of whites. But he has two solutions:
a) walk in the utility room and put clothes in the middle of piles. He calls this the "multiple choice solution".
b) walk in the utility room and put clothes in the recently emptied clothes basket. This is the "good luck Nic" solution.
I've explained the system to him many times. But today he told me again: "I just don't get it!". I guess I need to find another teaching method.

Don't think I'm a whiny girl friend. (I try not to be, anyway!) I'll quote my professor in my opinion of this: "If this is your biggest problem, consider yourself a lucky girl!". And I do. I'm a very lucky girl to have a great boyfriend like him! He's very handy and can fix anything that's broken. And we did agree that doing laundry is my job, so I guess I shouldn't complain...