worst night ever! friend trouble, parent trouble , EVERYTHING!?

Well one Friday night, me n my old best friend n another friend went to a sports arena & they were a bunch of little kids. my friend saw her cousin there so we said hi to them (they were the little kids) Later that night 1 of my friends left n my old best friend was just running around so i followed her & she saw my friends cousin she went over to the & keep saying " PARTY IN YOUR PANTS" or " IS THERE A MIRROR IN YOUR PANTS CAUSE I CAN SEE MYSELF IN THEM" then would run away. So i went up to my friends cousin n i said she is weird just ignore n she will leave you alone. But her friends thought i was saying stuff to her so they told their mom on me. N one of the kids mom came over and started screaming at me & i tried to explain that i was telling her not to worry and that it was my friend but she said dont talk back to me I'm an adult. So the girls mom told the manger n i ended up in the office with my old best friend & they called my parents n told them to come pick me up. When my dad got there the mom told him what happened. n when i got into my car i was getting screamed at & my friend didn't say a word. Later that night i sneaked on the computer to tell her i no longer wanted to be her friend n to stay away from me. She first im-ed me saying" I'M SO SORRY" n i said why didn't you say anything to the manager or my parents. Her idiotic answer was " I didn't want your parents to scream at me." & " i was waiting for the manager to say i need to call my dad" Then i told my mom that it was my friend but my mom kept accusing a liar. I was really mad & ended up being grounded for 2 months. Did i do the write thing to tell my friend to stay away from me? Or should i have said something else. Please help!

thanks & happy new year!