There are people out there who may never be able to value anything about you--these people are hurtful to you and a force to reckon with.
Why are they this way?
There are many possible reasons that makes a person disdain you, and first, you have to analyze the situation to figure out what you might do differently to change their mind. After analysis and attempts to make change, you may realize that there is little that you can do.
What do you do then?
If there is no known rational reason for an individual's negative behavior towards you, and no path understood for betterment, then you simply have to think carefully about how and when you interact with that individual. If a person spews hate in your direction all the time, you probably don't want to spend a lot of time with that person since they simply bring you down, down, down.
It's difficult to have angry, unkind, and hurtful people in your life. Rather than blame them or return the bad feelings, it's best to have a plan to keep the situation as positive as possible.