People who complain about it tend to believe that honesty and courtesy are opposed to each other. This is bullocks of course. It is totally possible to be honest about ones beliefs without being willfully belligerent, antagonistic, or forcing ones beliefs' into an unrelated conversational subject.
To be able to say the same thing either politely or bluntly speaks to the aesthetic quality of a language. Those who think that it is always more honest and masculine to choose the blunt way of speaking are, to describe them in the kindest and most artful language available, fucking idiots.