But that is the point of the show... and the contestants enter into it willingly.
The point of the show is to listen to the contestants sing and base opinions on their singing. The purpose is not to judge the contestants based on brief clips of their reactions to the judges comments. :)
In other words, if one wants to judge, based on a contestants 'attitude', so be it. There is more than one type of 'attitude', and they can be ugly, too. ;)