Small-scale AITA for you guys.

My friend (F) and I were eating and she was talking about something and I said “wait what?”

She got upset because she thought I was angry when I said that. I asked how was I angry, and she said that I used my angry voice. I noticed I did raise my voice a little but I just replied “oh no, I’m not angry”

She proceeded to stay angry and give me the silent treatment. AITA for not saying sorry here? I attempted to act normal becauseI’m working on not letting people bother me, but she didn’t want to conversate. I also acknowledge I didn’t apologize, because I refuse to apologize for things I didn’t do