saying the n word

hi i wanted to ask someone anyone's opinion on this so I am a black young gender fluid person, and I was adopted at a very young age to my parents who are white and live in Canada. My mother has always been very respectful and normal, lol and has never said any racist thing in her entire life that I've known her at least. today I was playing a song on our TV while she was out and I was blasting it really loudly as when does when parent isn't there and I guess I didn't notice that the lyrics were up. in the song, the N-word is said a lot, and as a black person I sing along with him, but that wasn't what she had issue with what she had issue with was that she could see the word because it was reflecting on the glass and I understand not broadcasting that for everyone to see and I apologize for that, but she decided that it would be perfectly OK in that situation to say the word and that took me back as there was no need for that so I'm not really sure what I'm asking him. I'm kind of just asking what to do and should I be mad at my mother cause I am mad at her and am I a bad person for being mad at her? This may be ranty and badly written and that's cause I'm using voice note text thingy