Knowing the theory of something doesn't necessarily mean you can put it into practice. I studied all kind of tutorials and videos about interactions, understanding others, communicating, etc. Still am not better at it than I was before.
I remember people being so unused to the sincerity that it confused the hell out of them or made them even more on edge
I'm the same way with anyone, I don't sound cold when I reply to your pm because it's you, but because it's how I am.