Why is it ok for parents to disrepect kids but kids cant disrespect there parents?

me and my parents fight like evryday they yell at me over dumb **** and they all ways call me you may think im lieing but im telling the dam truth my parents call me more than 30+ times a day to do simple dumb stuff and they call me broth like 7 times a day only becuas eh eis so fat and lazy and i get so mad becuase he get more rewards and he get to get what ever he wants but when i ask they get mad?im like wtf i do double more choirs then he do we use to get allowanxce it was only $5 dollars a week but i had to do choirs evry day and it was more then just 15 choirs clean and sweep a basment wipe walls clan dishes ween the garden maw the grass water the grass and way more idont geti it they expect me not to get mad but they tell me to do wll hthis stuff and i dont get no ******* reward or nothing. and you might soon see me on the news i might kill them one day lord forgive me but im sick of this ****!!!!!