Final answer:
The characters' indifferent reactions to the domestic disturbance highlight the social dynamics and desensitization in the French Quarter, indicating a gritty community atmosphere.
Step-by-step explanation:
The characters' reactions to Eunice and Steve's violent row in the French Quarter are significant to our understanding of life there because they represent the complexity and tolerance of personal issues in the community. Their reactions, or sometimes the lack thereof, imply a sense of normalcy or desensitization to such disturbances, which could reflect on the larger social dynamics at play in the French Quarter. This reaction is telling of the time period and setting in which the story takes place, revealing a certain grittiness and resilience among the inhabitants.