It may be true. A significant part of the world may be outside the "always lie to avoid offense" way of conducing yourself.
I would also say that "being direct" and "saying difficult things" are often not be the same. The former may just be "saying whatever pops into your head" whereas the latter is much more carefully considered.
Well, as in any other country: there exists rude people in The Netherlands as well ;)
So, the next time when someone says "Oh boy, I talked to this Dutch... he was rude!", what are the chances of that Dutch being a) straightforward, b) rude, or c) both?. I find c) happens most of the time.
Although not always easy, not letting yourself feel offended, assuming positive intent, and just walking away with a smile is a guaranteed win under most circumstances.
For us as practitioners of this behaviour, intended rudeness is actually easy enough to spot.