I hate my step aunt and uncle
What is your reason for hating your step aunt and uncle.
They are really rude to me.
They must not be much fun. It's okay to not like everyone even if they are your relatives, but still try to be polite to them.
I will never like them nor their kids. I found out that their eldest son is a murderer. He killed my friend in high school.
It is fine to not like people. You should not be forced to like someone if they do not treat you the way you deserve to be treated. Just remember that they are your family, so try to give them the benefit of the doubt if they do eventually come around.