Indeed. Things like the nightclub and the press conference will be replicated many times throughout the universe, as will Collider Movie Talk and American culture.
The issue of where definition derives from would require the story of causality being examined.
No one will doubt that the history of the United States or Russia exists, but by what definition (you raise a very valid point)?
Who are the American people? Who are the people of Russia?
It's a fact that people in Russia are interested in partying, just like people in the US, or are also interested in videogames, or are Facebook users, or the conundrum of which day to take off during the week.
The question is if people in Russia are all of those things, why is there a people of Russia? Why the UK, when British people are as much what makes great art or movie-making as Canadian people?
Generals in the US army are the people who fear to check their email, or their forum profile, and so why do US generals exist in the first place?
All the citizens in Iran are fan mail writers, or the opinion of whether Rogue One is right to exist, and so why are there citizens in Iran?
The sexiness of the three piece suit was the clergy in Rome, 600 years ago, so why did people 600 years ago exist as clergymen?
Life on other planets won't just be the symmetry of nations and nightclubs, and top 10 movies and Santa Claus; they'll also be forum users, wondering whether to reference US Generals as nightclubs.
I personally believe that life on other planets isn't meant to be interesting, and that intelligence means perpetual reflection.