Has anyone thought you were flirting when you were just being kind?

Rebecca
It feels odd asking this, but I have a decent amount of male friends. Obviously as all friends, some more attractive than others. I would like to add that I'm attracted- sexually wise- to females. 
One of my male friends, John, I believe thinks I'm flirting with another one of my friends, Derrick. 
I think this because I attempted to simply cheer up Derrick by giving him a hug and messing up his hair a bunch, although I thought it was simply a kind gesture and did not think too much about it.
I'm in high school as well, if that changes anything about the scenario.

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