Never glad, sometimes sad, often good for a laugh
Never kind, sometimes cruel, and if that's not enough
It can taste sweet or bitter, never sour or salty
It's right here in this riddle - but beware, for my clues are quite faulty
Name the thing being described.
A small author's note (no spoilers):
This riddle may be a tricky one, for reasons I'd rather not explain at the moment. If no one gets it I'll eventually add some hints.
Edit: Added an explanation of the trickiness at the bottom of KeyboardWielder's answer.