I try not to judge other people based on their looks - maybe it was a struggle just for them to get out of the house this morning.
I remember when I used to go to church with my family, there was an old lady who would show up in a robe and slippers. I remember my mom telling us, we shouldn't laugh at her, she was mentally ill and couldn't help it. Not sure how she explained that to under 10's but she got the point across.