Is AUTHOR wrong in the post ? POST : So, for awhile now I have felt like my parents been treating my 2 youngest brother as a favorite. 
Me and him have the same personality so I really don't like him (sibling stuff, I guess), but he gets away with talking back to my parents without consequences. I told my father my opinion about step parents and when he started getting mad I said, "okay, you're right." I guess I had an attitude because my father then slapped me and said how I don't get to have an opinion in his house.
If it were my brother my dad just wouldn't respond to him. My brother also gets away with snarky responses because he have a joking tone although he means it (if that makes sense).
The situation that happened recently is that, I am not doing too well in school grade wise (an F) and my brother hasn't either (2 Fs). He recently asked to go out with friends and he they sure. Parents let him go after asking who he is going with. wanting to prove that they play favorites (I told my mom about it and she said no, there is no favorites, they just want my brother to get out of the house since he usually just plays games) asked if I can go hang out with my friend(didn't really want to since they were out of town)
They said no I need to study. I brought up my brothers grades and my father said, "yeah, well he doesn't ask for everything."
Issue is, I buy my own stuff. I have a job. Im 17 and 2 months until im 18. The only thing I ask is to go hang out with my friends, but I do that too much according to my father.
I do all my chores and homework and I still get shit. When my dad does let me go out, he tears in into me, "you haven't even done your god damn chores." When I get home from work.
My brother is 15.
My dad had this weird thing where he yells at me then tries to kiss ass afterwards...
Today he came in my room (day after they scolded me for asking to hang out) and said I could hang out with my friend, he just didn't want me grades to drop. This irked me more because my brother literally doesn't do his stuff but he was off the hook. Today my brother went out with his friends again.

If it changes your guys choice, I also am a female and i grew up with 3 other brothers.

AITA for being pissed at my parents and considering cuttimg off my father when I move out?