Dear Rabbi Lazer,
Is there anything wrong with calling somebody by a nickname? There's this fat girl in our NCSY group, and everybody calls her "Knish" (potato pastry - LB). Anyway, yesterday, I said "how are ya, Knish" and she broke out crying hysterically. All the other kids call her Knish too, but even so I still feel bad that I hurt her feelings. Did I sin? If so, what do I do to correct it? Thanks, Barbie from Queens