Is OTHER wrong in the post ? POST : Throwaway because my bro knows my real account

A few months ago my headphones broke. I decided to buy another pair but better and more expensive. So I went to my parents and asked them to buy them. I chose a 160$ pair. They refused.

Dad started talking about how when he was my age he already had a part-time job. So I did it the hard way - I went to the local supermarket and what do I see - hiring now. I applied and the next week started working every Saturday and Sunday. 

The plan was originally to work only one month but when I saw the Halloween sale on Steam I said to myself: 'Okay imma buy some games and the NEXT month I'm getting them'. And I did. In the middle of December I received my paycheck and later that day I was rocking with a new pair of headphones. Hell yeah. After that I stopped working because school.

Skip forward to last week when my I got fed up with my bro asking me to use the headphones because his ones were shit. I said to him: 'Dude you need to stop asking me and get yourself a new pair as well'. He said he understood and went to do his business.

Yesterday I saw him wearing some Razor headphones and when I asked him how did he get them so quickly he said: 'Dad gave me money for them, why?' And I thought to myself 'Okay maybe they aren't as expensive as mine' then I asked him 'How much were they exactly?'....

200$. Forty dollars more expensive than mine. What the fuck - I thought, for what reason??

No reason. No birthday or big achievement or holiday. Nothing. Here comes the part that gives me anxiety.

He got a C in fucking maths. My parents are the type that REALLY care about grades. When I got a C in chemistry two weeks ago they grounded me for the weekend. 

I mean yeah, he is 2 years smaller than me, but still. They bought him new expensive headphones with his grades gone to shit, while to me that said no, get a job.

Tl;dr I asked my parents for headphones, refused told me to get a job. But then they bought my brother a more expensive pair for no reason whatsoever.