Is it wrong for me to partially blame my parents for not knowing spanish?

(sorry most of this is me ranting).....ok so i'm dominican and puerto rican and im 15. i was born in the us. my dad was BORN AND RAISED in dr. my mami was born here but she also speaks fluent spanish. i myself, however can't speak spanish fluently (i can speak basic converation but can understand a lot more than i can speak..but for some odd reason, people at school think im fluent ^^)now, for whatever reason, my parents hardly ever spoke to me in spanish when i was young. but now, whenever i bring up that fact that my parents hardly talk to me in spanish, they get all defensive and say stuff like "ohh, well y are you blaming it on me for?", "if you really wanted to speak it you would know it by now", "if you take spanish as seriously as you take japanese (i'm learning japanee in school), then you wuldn't have this problem" and blah blah blah....and then they start talking to me in spanish so that they can say see i talk to you in spanish... but whever i jut randomly talk to them in spanish, they respond in english, and when i say noo talk in spanish, they do.. for like 10 minute then switch back to english.. and then my dad get mad at me when i listen to reggaeton and spanish rap because it's "ghetto spanish" *sigh*.....now, since they always guilt trip me about how i alway but the blame on them, i wanted the opinion of some random stranger lol. is it REALLY wrong to partially blame my parents for my lack in knowledge of my ethnic language??