You should not favor some friends over others.
Linda, Greeta, and Gertude are out at the mall having lunch together.
Linda wants to share her cheesecake.
Linda gives both Greeta and Gertude a taste of a cheesecake.
Linda lets Greeta taste her cheesecake, but when Gertude asks to taste, Linda tells her that she wants to eat the rest.
Greeta and Gertude love the cheesecake so much they order slices for themselves.
Gertude feels left out and wonders if Linda is actually her friend.