A child who reaches for things on shelves is not necessarily destructive just inquisitive. Sure, it's fun to meet and greet neighbors in supermarket aisles, but your toddlers aren't interested in catching up on all the latest news. They'd rather wander, explore, touch. Instead of spending 15 minutes chatting next to the Oreos and Ding-Dongs, promise to call your friend when you get home. I'm afraid of strangers.
Few children appreciate being passed from lap to lap.
Most prefer getting to know new people a little at a time and on their terms. Be wary of forcing your toddler to accept strangers and new baby-sitters immediately. I'm not a pet or a trained seal. Some small children delight in showing off. Others shrink away, risking a reprimand.