I understand that it may be difficult for you, but the people we're talking about don't have ADHD, they're just lacking in basic life skills.
A lot of people spend their first 18 years with no responsibilities, they always had a parent or someone else to do things for them. They are then rudely awakened when they leave home and have to fend for themselves.
A lot of the skills that they were missing were things that I had been doing for years, because I was fortunate enough to have parents who taught me how to do things rather than just doing it for me. I disliked it at the time, having to do my own work, but it was important to learn.
Often the skills that my friends were lacking were just basic life skills, such as being able to sew on a button or a patch, how to operate a washing machine properly, how to change a car tyre or their oil (or at least check their oil), how to iron a shirt, etc. etc.
They were also lacking in more important life skills, like being able to budget properly and look after their money. I knew a group of girls in one house who ended up spending hundreds of dollars a month for electricity in winter, because they were running heaters in every room 24/7 to try and keep their uninsulated house warm, they just didn't even think of what their power bill would be and were shocked when they received it. I can't remember exactly what it was, but it was more than double what me and my housemates were paying.