LS, it was a probably a combination of events:
First, Friday—after work—is always a bad time to go grocery shopping.
Second, after your car was struck, you were "primed" for observations that you would ordinarily have overlooked as unimportant or taken as "personal".
Third, large stores tend to be depersonalized.
You are more likely to encounter neighbors and friends at Wolfeboro's smaller grocery stores. (And your neighbors and friends are also aware of such mutual encounters, making a "door-slam event" a rarity).
Fourth, when you arrived at your peaceful lakeside residence, you felt much less a part of "The Big City" that the area has become due to rampant growth: the contrast must have been palpable.
Fifth,
rural New Hampshire has always been more considerate of its fellow citizens in the past.
However, people have moved here from NY and MA for reasons
other than consideration of others, and it shows—increasingly—every year.
My chief gripe is sub-contractors' littering, tailgating and speeding.
