By their behavior, their words, their actions. Most of the time, parents don't generally hate their kids; most just get fed up with the child's attitude and how the child responds to them. So if you feel your parents hate you, the first step would be to analyze your interactions with them and see if there is anything you need to do to improve.
If your mom asks you to do something, do you do so willingly, or do you whine and complain about how unfair life is?
Logically .. By the same means as you would judge how anyone "hates".
However .. And having said that .. I feel compelled to also mention .. Don't confuse what you call "hate" with a parents concern and monumental frustration .. Typically brought on by the concerning behaviour and attitude of their child.
Short story:
I remember back when I was a teen .. When I felt unappreciated and under estimated. Even though I was never a "bad" kid .. I was given chores around the house that I absolutely resented and detested. I felt it was punishment ., and fuelled my anger and dissent for my mother. I too, felt as if she hated me .. And could never understand what I did to deserve such a "Cinderella" treatment. Most of my friends never had to wash floors, cook meals, wash dishes erecting etc.
.. That is until I grew up, got married and had a child of my own. That was when I realized what my mother actually was trying to accomplish. That was when I realized just how many skills I had that those friends didn't have.
I knew how to run a household., like a pro.
Don't under estimate what it is your parents are feeling ., or why they act the way they do. Take a step back and ask yourself if they are behaving in a way that is reciprocal of Joe you are behaving.
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