How people treat other people is a direct reflection of how they feel about themselves . If they treat others with kindness and respect, chances are they respect and are kind and compassionate with themselves as well. If, however, they treat others terribly, deep down they're likely unhappy with themselves and, more generally, with the life they lead overall. Narcissists tend to fall under this category because even though they may project an air of self-confidence, they're really trying to overcompensate for self-doubt and low self-esteem. It's been said that misery loves company. If people are feeling miserable, they often look for ways to upset others so those negative vibes can rub off on them. Maybe they tell you that you look fat in that dress, they leave you hanging with no explanation after you both agreed to meet up for drinks, or they reel off a list of your past mistakes -- all to get under your skin. Sure, you might  simply catch someone at the wrong m...