Why do guys ruffle girls' hair?

spacehats
The guy I like always affectionately ruffles my hair or playfully messes it up and covers my face with it, and I can never decide whether it means he just sees me as like a little sister or if it could be a bit flirty.

So guys, what does it mean when you ruffle a girl's hair? And girls, how would you see it? What kind of guys ruffle your hair? XD
Why do guys ruffle girls' hair?
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