Sure, it's possible you will dream about someone you like, but that doesn't mean everyone you dream about is someone you like. I've dreamt of people I dislike tremendously... and also of people I only met once.. or just saw and never met, etc.
Technically, our minds cannot make faces, so every face in our dreams is of someone we've seen before (in the streets for instance). I don't know if thats true, but I doubt dreaming about someone means you like them. Maybe in a certain context it might. paghahanap for "dream dictionary".