13 year old hanging out with a 22 year old

Karri

Okay so yesterday my little sister messaged me while I was at work asking if I still talk to my ex. Apparently she thought they were the same person since they have the same name, and she said she was hanging out with the kid. Well, I found out that the guy was 22 years old, and I freaked out. I posted something on Facebook about it to warn mothers in my city and she got mad and blocked me.

I'm not overreacting for being pissed about this am I?