It is common to disagree with peers, friends, family members and even strangers. Normally, it is harmless banter and one gets along fine with people with a different taste in pizza or a basketball team.

Certain political, religious, or cultural disagreements have a huge polarizing effect, something which is potent enough to destroy friendships and form lifelong enmity.

Different moral values make the person view the discussion as a right versus wrong or good versus evil fight, in which it is natural to make an enemy out of the other person, who is now being looked at in a different light.