Making value judgments on others' lifestyles and beliefs.
Different people have different values. This leads to an incredible amount of angst.
We spend a lot of time assessing, criticizing and judging different people based on their appearance, belief systems and schools attended. It doesn't matter at the end of the day. Most of the time, their odd dress, divergent beliefs and schools attended do not affect you in any way.
Life is what you make of it. Instead of wasting your time with others' lives, you may find more happiness focusing on your own.