[quote name='Coilte' timestamp='1339502435' post='1689335']
I agree, but IMO someone who cant simply say "thanks", lacks basic confidence, regardless of "excessive", "over confident" or the instrument in question. You dont have to be an egotist to say thanks.
[/quote]
Yes, but there are ways of expressing gratefulness for a compliment even without uttering a word. All a bit too subtle for someone, but not for others.
Also, we are talking about a special situation in this case, I think, not quite the same as giving a presentation at the office etc., as music is art, and isn't "measurable" in the same way as other kinds of performance.