Video from Wretched
"When I was in elementary school, we had a little game that we would play in which we would touch someone and say, “You have cooties.” Of course, we had to have a way to defend ourselves, so when someone would touch us and claim they just gave us cooties, we would say, “Not me, I don’t have cooties.” Then we would hold out our hands, revealing the handwritten initials, C.P., which stood for “cootie protection.”
I think Christians are sometimes that way around unbelievers. They appear as though they are avoiding all contact with them. I can understand not wanting to be influenced in a bad way. But how about influencing others in a good way?
Jesus said that as Christians, we are to be salt and light. In Jesus’ day, salt was used as a preservative. It was rubbed into meat to stop the rotting process. So, as salt in a culture, Christians are to stop the spread of corruption. But another thing salt does is stimulate thirst. So we are to stop the spread of corruption and stimulate a thirst for God in others..." from the article: Should Christians Isolate Themselves from the World?