Chopstick skills-use a fork

The backstory to this it was my gf birthday last month so a friend and me made a cake for her. (she loved it) So another friend comes to help and we give cake to here...but we dont have alot of utencils so....the other friend named Yaya, decided to go and get her chopsticks and eat her piece of cake with skills....while my girlfriend ins the background has a face of why can't she use a fork? XD (note my gf is not iggorrant...and I can't spell)