Try the OP like this "My partner isn't pulling his weight he doesn't share the chores/kids/DIY whatever". MN response "You must be lazy, you should be doing his share too, if you're sooooooo fucking lazy pay someone to do it. But whatever you do, penis must be placated. Poor penz".
This happens in RL too - I've got a few friends who do everything including all the DIY, work full time, run the house and take care of the kids, and the H simply does his normal job and eats food. I've noticed this is more likely to happen if the female partner has an underlying illness or condition, temporary or otherwise, that would normally mean she couldn't undertake heavy work.
You then get the strategic incompetence - man "tries hard". Not his fault, nothing can ever be his fault. He tried. Rinse and repeat. This can happen more or less in most partnerships I find, its one of the reasons I am divorcing (like a PP mentioned?) - not the sole reason, but a fairly major one.
Sorry I don't have the answer OP, even when I told my H I'd applied for divorce and even in Relate, he still said he'd done nothing wrong. Well, he'd definitely done nothing, and even if he had, it wasn't his fault ... 
Woman doesn't do her share - lazy cow.
Man doesn't do his share - his partner is a lazy cow and don't upset him by asking.