I am not particularly good at knowing or guessing at why someone is upset or happy. I can sometimes tell, but I do not usually think they are directed at me either good or bad. I find it quite irksome when others (I have a good number of friends and my partner who think they are especially empathetic - comes with the lesbian MSW thing) think they know what or why I am feeling something without consulting with me on it. While they may get the what - they are almost always wrong about the why.