It's the latest 'revelation' that he was picking her nose for her. It is just out there in the weirdness of it all. The snide comment about even domestic goddesses get snot- I mean that is just so demeaning and peculiar.
In what world do partners fetch bogies out of each other nostrils? The fact that he has put this forward as an apparently normal statement of fact indicates to me he has either gone over the edge or is trying to further humiliate/abuse her.
Whatever way- he is a sick man.