Labels get us into trouble. Labels separate us one from another, and keep us swimming in our end of the pool, safely out of splashing range of "those" people who might rain on our political, religious, socio-economic, and world-view parade. 

Labeling others is the practice of quickly categorizing another person or group into a box of our own making, and of our usually limited understanding. Labeling others is the easy way out. I know, because I do it all the time.