Maybe slightly less than half a pitcher of beer is more than enough?
If I pay for half a pitcher of beer, and you give me less than half a pitcher of beer, you still owe me more beer.
Also, if you’re upset about how movie theaters are a scam, why are you defending this scammy behavior? No need to be self-righteous about alcohol consumption, Cinemark is defrauding customers by selling 24oz beers that aren’t 24oz. You can drink however little beer as you want, but you should still want honesty from the people selling it to you.