How about that no matter the age of the child, there is an inyan of kibbud av v’em, and if the parent makes reasonable rules, the child has to follow them? If they want to be treated like an adult, fine, but they have to take the whole package, they cannot pick and choose when it suits them and you have to be consistent about this. Tell them that if they want to claim they are an adult, give them appropriate responsibilities. If they don’t wish to comply, then they don’t get the privileges of being an adult either. It’s tough and you have to stick to your guns on this, but unless the child is really rebellious they will eventually see that it’s better for everyone, them included, when they follow the rules.
Have you ever watched World’s Strictest Parents? Some of these kids really change for the better once they have experienced consistent parenting.