I got into a fight in elementary school and never told my family the real reason it happened

I was in 4th grade lol, I’m 19 now and I just remembered this happened.

Basically, I fought a boy because he said “I left a condom in your mom’s bed.” I didn’t know what that meant at the time (why should I?), all I knew is that he mentioned my mom with the intent to provoke me and I punched him in the nose. He got what he asked for. We fought and I won, the only reason I say this is because he got made fun of for getting beat up by a girl.

I didn’t get in trouble for it because they knew what he said but I did get sent home. I didn’t tell my family what was said when it happened, all my mom knew was that someone said something mean to me about her and I decked him in the nose. She picked me up with a smile on her face and I left it at that.

I’d like to say now that I get it, I want to punch him in the nose again.