Sadly, in contemporary corporate culture, the truth is considered rude if it's at all negative. You're supposed to imply it, and if that fails you can speak it but it must be sugar-coated heavily to avoid people taking personal offense at it.

And to be clear I'm not talking about rudely blunt truth (which can indeed be pretty rude), I'm simply talking about inconvenient facts that people don't want to hear and try not to acknowledge. Things like "the Facebook engineers belittled our product" should instead become "there were personal chemistry challenges between us and the Facebook engineers." Instead of "the Facebook engineers were young" it should be "we had a culture mismatch" or something like that.