When you know someone whom you absolutely partially or wholly detest, consider the fact that they would have some people who accept them that way. The only way that those people would be level headed is in the fact that the guy/girl whom you detest is not all that bad. He may succumbing to his inner fears*. To give yourself a wider perspective of the situation, consider what the other group of people or other person may like him/her for and why those traits in him/her you don’t see. It all rounds up to the fact that there should ideally be no reason that one should lie, back stab, be dishonest or just be in a pain in the ass.
One’s inner fears are the childhood/younger days apprehensions that he has been brought up in. It is true that as children what we learn never forget and abide by our entire lives.