A lot of us behave differently in the goyishe world, then we do when we are in the frum community, Why?
I think maybe it’s because as children our Principals, Rebbeyim, teachers always used to warn us before a class trip -“You had better behave, you don’t want to make a chillul hashem!”.
Why do people treat strangers better than their own family members, at times? It’s because they want to IMPRESS the stranger and don’t feel the need to do so for their own family.