/ck/ - Food & Cooking

>>13098889
>see it all the time in TV and movies
You're not allowed to advertise alcohol on TV shows or in movies so the Solo cup is a quick and generic way to say "beer"
Notice how even in actual beer commercials, at most people are just hanging around with bottles in their hands, no one ever takes a sip.

As for real parties, they're mostly for when you've rented a keg or want to set up a beer pong game. If people are pouring their bottles out into cups then something is very wrong.