I don’t understand?

I was walking to my car before, and I just randomly looked into someone’s car and accidentally met some girls eyes through her windshield. Turns out, she’s in my grade, though I’ve never talked to her because she’s never been in any of my classes. Then the next thing I know, she flips me off!

I don’t know why she did that. I’ve never talked to her. She’s not a particularly bad person, but I know nothing about her.

I couldn’t actually ask her because I was just taken aback so I literally ran away.

(And before you ask, no I wasn’t in her way, and no I wasn’t staring at her, I just randomly looked over and she was there.)
I don’t understand?
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