Depends on what one's definition of sugar coating actually is, at the time.
A month ago son hit lead off batter and he was po'd at himself. The next day, after same hitter was hit by a different pitcher, realized this hitter has been hit like 15 times. When I pointed that out to him, he said I was sugar coating. I thought I was making a good point, with facts.
There is a difference between sugar coating (everything will be fine), and brutal honesty (you stunk tonight kid) and I can tell you that most of our sons know the difference.
Moms do tend to be a little more understanding when sons have a bad outing, because that's how we were made, where as dads tend to let sons know how disappointed they were because he should have done better. A dad on sons HS team used to leave during games if son struck out or didn't come through that night, I found that to be rather sad, you support no matter what type of game you are having, whether you like the results or not. And then there was the dad whose son didn't pitch well, and it was everyone else's fault but pitchers. Truth was, he was just an average HS pitcher. I often heard him tell his player after the game HE was great, the team stunk. I have actually thought that on occassion to myself regarding my own, and have said so, but now realize that is NOT what he wants to hear.
Supporting and helping your player to live up to his potential is not sugar coating, telling your player he is better than the kid next door (regardless)is. He may well be, as long as he knows down the line he will meet up with players equal or better, and can accept that, he will be fine. The smart parent never lets on to their player that they are THE best, but helps him to understand how he can always work hard to be a BETTER player.JMO.
We have found the greatest challenge the past two years was having a player who always did well in HS, to struggle at times at his game. In the beginning you tend to be sympathetic and supportive (with maybe some sugar coating), a bit later on you realize you need to let them figure it out by themselves without your sympathy or BS coating, but still being supportive in what they are doing. They tend to figure it all out themselves anyway, regardless of what you say.