St. Paul uses this to his advantage when appearing before the Jewish leaders. Then Paul, knowing that some of them were Sadducees and the others Pharisees, called out in the Sanhedrin, 'My brothers, I am a Pharisee, the son of a Pharisee. When he said this, a dispute broke out between the Pharisees and the Sadducees, and the assembly was divided. Each of these words conjures up a stereotype that may not apply to the person at all. Be careful of labels that discredit individuals.
Labels can also disguise the truth.
Spiritual-sounding labels can also be abused. This is what God did in my life, so He must want to do that same thing in yours too. This is a real danger in a personal experience story. Secondly, many times we assume guilt by association. For instance many organizations are split several ways on key issues.