I actually am a native, American English speaker, and while I am aware that the common usage refers to somebody who is able to handle loss without taking offense, I did not rest on the assumption that the common usage was the relevant usage here. I would consider the meaning of the quote given the common usage inaccurate, as I find the implication that a gracious loser is necessarily an unmotivated loser incorrect. Therefore, I left open the possibility that the quote might use a less common meaning of the term "good loser".
The speaker is a football guy, if that helps. But yes, I also find it a distasteful remark. You can improve without being in poor form in front of others (or even in private, really). And it's pretty rare to literally NEVER lose.
Another month has passed and here is a new rationality quotes thread. The usual rules are: