All languages have a culture associated to them. It's hard to dissociate the culture from the language. Even English, which is used in different cultures, has local optimizations when it is used daily. Latin is bound to an ancient culture (and a religious one). Even Klingon and Quenya are bound to the universes and cultures created by their authors & fan bases. But I don't see any culture associated with Esperanto. I…
Esperantist and conlanger William Annis (on the Conlangery podcast) said something to the effect that, if you go to a Esperanto congress, you should start with the default assumption that everyone you meet is a gay vegetarian. [1]
I cannot speak to the truth of this myself ;)