I think it's the difference between being blunt and being diplomatic. My wife has had to learn the inverse of this. She's always honest. If you ask her opinion she will tell you exactly what she thinks. Most times you don't even need to ask.
But when I first me her, she was simply blunt. Which hurt people's feelings or caused them to feel as if she was attacking them (she was not). Over time I finally managed to get into her head that there are ways of getting your point across and giving your opinion without delivering it via a 2x4 to the head.
Given the profession she's chosen (teaching), that's all the more important now.