dude some people just take things way to fucking seriously

Okay, so i have this ex friend right? we stop hanging out, and thats that i thought we would move on from that. But one day, i decide to post a tiktok right? My best friend was thinking of starving herself and she doesnt really take things seriously so i made a little audio expressing thats shes not fat, and eating 3 times a day is normal in a unserious way. We both laugh at it, and i decide to post it onto tiktok. Now heres the thing. All the comments i received were positive and stuff except 1. Which was a venting account, saying; "You know whats annoying, when you stopped bringing food to school to take everyone elses" And i did do that but it was because i had barely anything from home to take for lunch so thats why i didnt bring any. In this whole situation i was unserious saying; "BAHJHDJ HOW THE FUCK DID YOU KNOW I DID THAT" but then i realized, wait. how did they know i did that? And later i found it was my ex best friend. She made an anonymous account just to comment that. And later we got into a whole ass argument (which i ended up winning) but ill not dive into that because its WAAYYYY too long. The whole entire time she just wanted to talk about her parents getting a divorce and were not even friends anymore so why should i care? like boohoo bitch you're not the only one whose going through that.