Answer:
It seems that the author, a Latina, experienced an unexpected and somewhat uncomfortable situation on a bus trip from Oxford University to London. They were approached by a young man who had been drinking, and he proceeded to sing "Maria" from West Side Story to them in a rather theatrical manner. The author's fellow passengers were polite and applauded the man's singing, but the author did not find the situation quite as amusing. They describe attempting to maintain a reserved and cool demeanor, but also reflect on the fact that their Latina identity is always with them, no matter where they go or how they try to present themselves. This experience seems to have made the author acutely aware of their cultural identity and how it can affect their interactions with others, even in unexpected and seemingly unrelated situations.