Except you get dirtier, you get wetter lying in the rainy puddles, there is a greater risk of rats in a subway station, and you are suddenly visibly demoted fro

Except you get dirtier, you get wetter lying in the rainy puddles, there is a greater risk of rats in a subway station, and you are suddenly visibly demoted from being someone who wants a lie-down on a bench to someone who looks homeless, which decreases passers-by's sense of empathy towards you.