Share with that person our textbook description of their subgroup and ask them to comment on what they see as accurate or inaccurate from their viewpoint, $2)$ ask them to name $2$ products or services they believe would appeal PRIMARILY to that consumer grou even if they don't personally buy them, and $3)$ ask them if they could provide any examples in advertisements, TV shows or movies, books$/$magazines$,$ etc where their subgroup has no been portrayed accurately.