I disagree....it's really none of their business.From my point of view he could have been buying the beer for you since you were there helping him and it would be irresponsible of them not to make sure that you aren't a minor.
I mean, why don't they just go right ahead and follow them home to check for additional 'minors' in the household?
...and 18 isn't a "minor" anyway...
Yes...it's total bullSh!+, in my opinion....either you are an adult or you are not. period.I don't drink and don't plan on it after I turn 21, but I don't appreciate being prohibited from drinking though I can vote, sign contracts, be conscripted, be prosecuted as an adult, smoke, dip, chew, drive, own a business, etc.....
That's the only thing that really makes sense.