In A Streetcar Named Desire, by Tennessee Williams, there is a heavy focus on characters-- their emotions, their actions, and how they influence each other's emotions and actions. The characters that Williams has created are so textured and engaging that it's easy to ignore the implications the play has about culture, as well. The characters clash upon contact, but what really makes them act this way is the clash between cultures they experience.
During the time that A Streetcar Named Desire is set, people do not live on huge plantations with hundreds of slaves, but some remnant of the culture that went along with this lifestyle remains in existence. Blanche and Stella grew up in a large mansion, Belle-Reve, somewhere in the rural south. Although it is not explicitly discussed, they surely recieved treatment during their childhood that was aimed not at readying them for life in a rough and tough city, but to be prim and proper ladies in a society that values chivalry and ladyhood more than anything else. This explains why Blanche is so shocked when she learns where Stella lives; she can't believe that her sister is living in such spartan accomodations in the heart of a bustling city, where femininity is essentially the last thing on everyone's minds. She is unable to adjust to the new and unfamiliar nature of this masculinst culture, and this contributes greatly to her eventual mental breakdown.
The greatest conflict of all, the one between Stanley and Blanche, is also a result of the inability of classes to mix. Stanley has his entire personality built around being a man in the big city, Blanche has hers built around being a woman in a rural setting. This means that the characters are worlds apart, and essentially share only a connection through their sexuality and through their respective relationships to Stella. In Blanche's world, women are supposed to be ladylike and submissive in some regards, but are also to be treated as sacred cows; to beat a woman would be unheard of. From Stanely's point of view, women are to be submissive in all regards. He thinks that they should be helpful and romantic, but should also take anything, even a beating, as though they deserve it. The initial sexual tension between Blanche and Stanley sets up the whole situation for disaster: they are brought close together by this, but then the tension breaks, and they have to live together while Blanche tries to find a home. Their clashing immediately becomes evident, and Blanche's feminism is contrasted more and more with Stanely's unflinching and aggressive masculinity. Stella becomes more and more sensitive and emotional in her quest to get someone to love her, and Stanley becomes more and more infuriated with her because of this. Niether side in this altercation can even remotely see where the other is coming from, and this eventually results in Stanley raping Blanche.
A Streetcar Named Desire is an intriguing play with deep characters that are easy to pay attention to. More importantly, though, it is a window into the class strife that was present in the United States during the 1920s and 1930s, and the terrible things that can result from it.