Why would a teenager laugh at a fully grown woman?

Emmadavidson
I'm 23 and I was out today with my mum, having a walk. We walked passed a teenage girl who was about 15/16. When we walked passed, I heard her saying something to her mum about me and then she laughed. I'm not being paranoid - even my mum noticed. I would have thought she would laugh and snigger at people her own age, not a 23 year old woman. Any opinions?
Why would a teenager laugh at a fully grown woman?
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