Answer:
Jean thinks that adults are incapable of having any interesting conversation with.
Step-by-step explanation:
In the story "Homesickness" by Jean Fritz, the author provides a look into the life she lived when she was a child, having to stay in China. The autobiographical yet fictionalized account of her life living in an unfamiliar surrounding in far China gives a sense of what Jean thinks of her own identity, stuck between the two cultures yet unable to identify with any side in particular.
The given excerpt talks about how different the concerns of the children and the adults seem to have. Jean states "grown-ups made friends and talked their usual boring grown-up talk", suggestive of what she thinks about the adults' lives. To her, it seems like the adults are living a rather "boring" life, talking about the useless and boring "grown-up talk". This seems to show that Jean thinks the adults are difficult to have any interesting conversation with.