Have you ever loathed yourself so much you genuinely despised people who like you for being pathetic?   

That's why most people freak out when someone shows interest in them, Their self loathing makes them think "There must be something wrong with that person if s/he is showing genuine frank interest in me" And that also makes them feel that the people who treat them like they are inferiors to them are the right ones for them. Because, in their minds those people know better than liking them.  

That's messed up. And, it's one of the reasons why this world is a sad place.