8. Picking your nose
Yes, it is a bad habit and the kids should learn from a young age not to do so in public. We always tell them to either use a napkin or go wash your nose in the bathroom. However, adults are just as likely to do it as kids do. Sit on a red light on the road and look sideways and you can find a lot of people furiously picking their nose. Some people don’t care while some are not even aware of people around them.