Why would a random stranger act annoyed to see you and stare you down?

I was walking downstairs when I saw a strange girl ahead of me walking in the same direction. When she saw me she stopped walking for a moment, gave me an annoyed stare and then walked into a store. When she was leaving the store she turned around to give me a weird stare. Why? I never saw this girl

Why would a random stranger act annoyed to see you and stare you down?
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