What bougie venue you been to that uses anything more fancy than a clear solo cup? Every concert I’ve been to in the last… 5 years at LEAST has been either a plastic bottle with the cap removed, a clear plastic cup, or a liquid death.
At least here in Germany everyone is selling drinks (beer as well as Softdrinks) from the tap in cups with usually 1 or 2 euros as a deposit so people don’t throw them to the ground and create a hazard
Often the cups are also branded from the band so I collected a couple over the years