Georgia's Paradoxical Drinking Laws: Parents don't have to support you, but still have say over whether you drink?

In Georgia, it is a crime for anyone under the age of 21 to consume alcohol. The only exceptions are:

1) When prescribed by a doctor.
2) As part of a religious ceremony.
3) Inside the home of a parent who is present and has provided the alcoholic beverage.

Does anyone else find this third rule really strange? So basically the only way that a 20 year old may consume a drink is if they are at home with their parents who so approve.

It is outrageous that a parent who no longer has any obligation to support or provide for you in any way still has authority over whether or not you may consume an alcoholic beverage.

This law means that an unemployed 20 year old still living with and supported by his parents may drink alcohol if they so approve, but a 20 year old who has moved out on his own, works a steady job, and pays his own taxes to the government may not drink. This law is absolutely ridiculous and completely absurd.