Basically I think that a lot of us lump people into various 'stereotype' groups without letting them show their true selves (either in a serious or joking manner). In a sense, by doing this, we are subconsciously judging each other when we are probably not looking impartially or objectively at a person. We aren't really in a position to give judgement, especially unfounded judgement on people. Rather, we should be trying to find out one's true character and personality, and also encouraging and spurring each other on to be more Christlike. Unfounded judgement towards someone can destroy one's self esteem and be hurtful towards our brothers and sisters in Christ. Lets be positive, uplifting and encouraging, instead of negative, stubborn and critical in our actions towards others.
"And let us consider how we may spur one another on toward love and good deeds. Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another—and all the more as you see the Day approaching."