And what will you accomplish?
If a person comes to you stating that they are not happy with their level and wish to improve, you have been given an invitation to offer advice, instruction, opinion, etc…
If they have just performed, they have asked you nothing.
Being polite cost you nothing.
Telling the person what you HONESTLY thought of their performance, unquestioned, will only lead you to make an enemy unless the person was abo****ely awsome.
It is good manners to applaud or thank them or the demo… ore even smile…whatever…in public or to them. What you think is another story.
Case in point. A few years ago while judging at a competition, a competitor came up and did a broadsword form. He had ZERO basics. Each of us judging had to hide our mouths and work at it to NOT laugh. But…about 1/3 through his routine, he did what was supposed to be wrap the head/hide the sword…But he did it like twirling a lasso over his head…and was holding onto only the end of the broadsword. At that time, we all began looking for where to jump if he lost the weapon.
When we met to discuss how LOW to score him, it was decided that one of the judges would have to explain the reason for the score. One was chosen. That judge then told the competitor “Son, you are horrible and you need to find a new teacher…” In one sentence, he alienated one competitor, all of that competitor’s friends, classmates, the instructor…and made sure that even though his words were true, they would be ignored…
Would it have hurt to have shown one basic and said you need to work on things like this…and let it go at that…
There is a definite art to minding one’s tongue.