Idk I find it pretty disrespectful when you don't clean up your own stuff when you are in someone elses house. Heck even my own house (granted I am the only one here so it would be disrespectful to myself lol)
It's pretty crazy peoples manners these days and lack of respect for one another and property. But hopefully us good people can help curve that in some way.
I agree, mom said he is a bit unaware of his actions when it comes to these situations because of his upbringing. We forgive and be kind. It's frustrating, but I find that many people in the remodeling construction business act this way.