[Viliam1234]

You can eat lentils, and no one will suspect that you eat them because they are the only thing you can afford.

Now imagine a community of people where half of them are so poor that the only thing they can eat are lentils, and the other half is 10% richer. By not eating lentils you demonstrate your (relative) wealth within the community. By eating lentils, you show that you are poor even among the poor.

People hate being at the very bottom of the society.