When you and your friend have different standards, you might have a conflict over what difference between you?

I believe the answer is: Values

Values refers to the things that we regarded as 'important' in our life. The values that we have tend to be influenced by both internal (such as personalities & memories) and external factors (such as experience, education, and society around us). This value would determine the 'standard'that we have to judge which is good and bad.