It's not so much lifestyle lectures, it's surprise that they cannot even put together a basic meal.
It's not rocket science (although it is chemistry!)
What would happen if they were suddenly left on their own?
Or if the partner became ill and he needed to cook?
However, every family divides tasks differently.
My husband cooks very well, exceedingly well, but he won't use food that he has no idea my intentions for - he doesn't want to ruin a plan.
Likewise, I won't go in his work buildings and rummage around taking items that he may have a use for.
Just as de-cluttering, partner may have a use for an item.