The fact that few, if any, strangers may have struck up conversations with them there indicates that most people are not receptive to the idea of these places as informal "singles bars." And for the shy person, where even little details matter, any lack of receptivity by another person can be fatal to one's self-confidence.
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True, the romantic image of the supermarket may consist of meeting the man or woman of one's dreams in the frozen food section: you and he (or she) smile at each other, your hands brush as you reach for the T. dinners, and the next thing you know, a wonderful conversation has ensued.