It sounds like a typical boy but by this age I'd expect them to grow out of it especially when it's not their house
I still live at home (with the cost of living on my wage I just can't afford it on my own) an there's no way my folks would put up with that from me, while I do have a games console, it's not in their living room, I have my own living space that it's in an I'd NEVER have the place a mess, as much as I live here it's still not my house, I could also imagine how fast I'd be kicked out if I expected my parents to act like a waiter/waitress as well
It sounds like he thinks because he's home he can be a kid again, have you spoken to him about it? I'd also speak to your husband as well about not enabling it so much, it isn't fair not to have the support of your husband or be treated like a waitress