Why do parents hate tomboys ?!!

they probably just don't like girls acting like boys because it affects them later in life. my mom hates my tomboyish ways too. but i'll never stop being a tomboy!

Because in the beginning they were proud to have a girl that they thought she will become a girly girl , too sweet and too kind :P

Parents don't hate it if their girls are tomboys. They should accecpt you for who you are, Instead of being mad at you because you don't fit THEIR and only their idea of what a girl should be.

My mom isn't exactly keen on me being a Tomboy either. My dads okay with it, but my mom sometimes tries to encourage me to be girly and pretty.
One time, she even asked me if I was becoming a lesbian, (she was joking of course). I don't hate lesbians, but it kinda hurt....
Anyway, to answer you're question, I don't think parents hate Tomboys. If you're parents don't like you being a Tomboy, then tough! Its who you want to be, so be it!

I'm a girly girl but my parents actually want me to be more boyish

Maybe it's because your parents are trying to put you in a position where they are going to change everything about you, and it stinks, but they won't always except the things you like and the things they expect from you.