Why do other woman stare at eachother?

I'm probably being really paranoid, but lately everytime im out in public there's always at least some other woman who just stares at me and will not break the eye contact , for example I was waiting in line for a coffee and there was another woman already waiting for her food and she's just standing there staring with blank look. It makes me feel insecure and unsure if there something wrong with me. Why do other women do this

Why do other woman stare at eachother?
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