It's called projection and we all do it. We tend to project onto others our own issues and concerns. And it's important to understand this. That's why I wrote about it in my book about how the world doesn't revolve around you. When someone judges you unfairly it has very little to do with you and every thing to do with them. It isn't about you. It's about how they feel about the world and themselves. And that's not just folk wisdom, scientific research actually backs that up.
See: What you say about others says a lot about you : http://www.sciencedaily.com/releases/2010/08/100802165441.htm#.TpcmRlX_6M0.blogger
Also - thanks to Empathy Heals for first posting the story: http://www.empathyheals.com/2011/10/what-you-say-about-others-says-lot.html