Of mice and men
The second cultural assumption I noticed on the book of Mice and Men is women are treated unfairly.
Steinbeck shows this through the characters with Curley and his wife because Curley thinks that his wife should do whatever he wants from her. An example of this is when Curley always wants his wife to cook for him and he also tells her what to do the majority of the time.
Curley's wife is an outsider who dresses up and flirts with guys to get them in trouble.
At the time of this book women being treated unfairly was quite common and I personally think that this is disrespectful and unfair.
In my opinion Steinbeck accepts this assumption by making us hate Curley's wife and it also makes us hate Curley.