This is still gross to me

So a few days ago, I was driving around in Countryside. As I wait at an unusually long light I look in my rearview mirror. To my horror an older woman was picking her nose! She did have a tissue between her actually finger at the nasal cavity, but that is still gross. I know everyone picks their nose. However when you are in a car you are surrounded by windows. Why do so many people think they are invisible when they are in their car? Anyways I was grossed out.