AITA for being annoyed at being called my gfs “friend”

Btw for context me and my gf are both female

The other day my gf let’s jst call her S was playing Xbox with her exs friends lets call them A and B now I don’t mind she was playing Xbox with them at all S offered to add me to the call so I said yeah but I decided to also add my friend we will call her C me and C was on call previously so we was continuing our convocation from before then A randomly says ”hi it’s S’s exs name” and started laughing S then looked at the call as if to say tf then A goes “Haha don’t worry just pranking your friends” I then just stop and my face drops I end the call and message S about it saying how it pissed me off that I had been called her and she starts calling me petty and saying she can’t control what others say so I say “i know that but you could at least of said A you know she’s my girlfriend why would you call her my friend” then S snaps back and says “I was playing Xbox I didn’t hear what she said”we end up arguing for 3 hours straight about it i end up crying for ages because I didn’t understand why we was arguing when I was just trying to tell her how it made feel so am I the asshole for getting annoyed at being called her friend