jimjam, I partially agree with you. With respect to Ed Sheeran and Suicide Squad, etc., you are simply identifying what we would all do well to remember: that is, the distinction between subjective perception and objective reality.
In terms of how we communicate that, though, there is certainly no need to act like an asshat. Being ‘as honest as possible even if it is uncomfortable’ is, more often than not, just an excuse for being uncaring and unmannered.
When we’re being lied to, however, such as when the media tells us that something is great and it really, really isn’t, than sure: be critical all you want.
Ultimately, though, there is seldom a call on any of us to be nasty.