What does it mean when a guy calls you kid?

So I used to talk to this guy and I don't know If I asked dumb things and then he was just like " just research and practice on the work kid" but he's 19 and I'm 18 and it was over text but the thing is I like him and I don't think he knows, was it bad that he said that?
What does it mean when a guy calls you kid?
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