What does a girl mean when she says "you always know the right thing to say?"

sage-of-caring
So I've heard this from many girls. And I don't get it. I am supportive and I usually try to say things in a good tone, even when I'm telling them they are wrong. The thing is sometimes I don't think I said anything, I'm not sure if they really mean I said the right thing or is it kind of a clue or hint about something else?
What does a girl mean when she says "you always know the right thing to say?"
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