Yes of course, my hundreds of personal parties attended are invalid evidence compares to your personal experience of several commercial venues (which is not even what was being discussed).

I don’t care about downvotes. Parties full of red plastic cups is a very American phenomenon - and also in countries that have low environmental concerns and use a lot of single-use plastics. All through Europe, Australia, NZ, Japan, its far more common to use glassware or bring your own cups. I’ve only been to a few keg parties because it’s no cheaper than buying cans/bottles unless you’re running a really big event like a wedding - and even then, proper glassware or washable plastic schooners are included in the hire contract (kegs are hired and must be returned).