I think the rule is really dumb. I say this as the girl in the seat in front is eating pretzels. Fine those who litter the metro heavily but people snacking its a essential activity.
Of course last year a teenager was handcuffed for eating french fries on the metro- come on we live in a civlized world and we have better things to do than stop people from eating.
I think my metro eating rule violater has finished her snack.
My few cents.