who's right in this situation, me or my sister?

[Brian Fahy]

okay so today my mom bugged out on me because i got a 66 on an english test and she was saying how i didnt study even though i did. and so she just annoyed me so much and telling me that im not trying hard and that i won't get far in life because i got that grade. and so i write on my twitter "i can not stand my mom holy shit" and so my sister was like you're being a bitch about mom and like its mean and like how would you feel if mom wrote that about you. (and sidenote: my mom doesn't have a twitter and doesnt know my account name so she wouldn't find out) and so i was like everyone does it and you did too so don't tell me how to live my life. and now shes like dont ever ask for advice again from me. like is it me thats being the bad person or is she flipping out as well.

i understand this is long but please read it and answer it seriously.