My friend said my mom is deaf 😭

So in Afrikaans class a boy had to sing infront of the class because he was singing while we had to work. So this boy went in front of the class and started singing. So he started singing a part of one of my favorite songs. Okay so we came out of Afrikaans class to go to our next period and the song was was stuck in my head. So I'm singing on our way to natural science class and my friend start tripping on me because I told her in the beginning of the year I can't sing. So I told her my mom told me that I can't sing, so then she said "Well your mom must be deaf or have a hearing problem.".

How should I feel about this?😭