I'd say that the aspect of culture that this excerpt from "What For" by Garrett Hongo celebrates is A. holidays.
It is customary in some countries to spend holidays with family talking about past times, and reminiscing.
Love at first sight
This passage is describing the way Armand fell in love, in the same way everyone in his family fell in love. It describes the love as being shot by a pistol which shows that it happens immediately the first time they see the person that they are falling in love with.
