Grrr.
I've spent 20 years training bringing up sons to be decent functioning adults, capable of taking care of themselves. For example, they've stripped their own beds weekly since they were 5yo (inspired parenting btw, I have never handled a teenage boys' sheets 
), they cook regularly, they've had step by step bathroom cleaning instructions on their phones since 10yo and used them often.
They've also had to deal with the natural consequences of being "forgetful" whether that was homework, getting somewhere on time or putting fuel in the car.
They can do it and they do, most of the time, at home.
However DS1, I'll admit can be lazy and if he thinks he'll get away with it he will. I've noticed that his girlfriend and her mother rather than finding it annoying when he "forgets" or "needs" help with basic things find it endearing.
"Aw bless he needs a woman's touch"
"What are you like? Give it here."
And all the domestic admin, remembering birthdays and appointments, organising trips or nights out. He did fine on his own, but now he has these two women organising him.
Why do women do this?
Of course it's appalling that he lets them, but I think we'd all take the easy life if we were being encouraged to do so? In some ways I worry for him that he's become so passive.