leave notes back "yes I can see them" and carry on.

leave a smiley face with have a nice day.

"when would you like to do them?"

or just ask him to stop leaving notes cuz you find them offensive and you're capable of seeing that there are dishes on the counter. Its all part of working out the arrangement till everyone has settled into their niche if possible.

He's probably doing it to avoid confrontation, thinking his notes are a kind way of asking for your help. hopefully he's willing to do his share too.