I found out that people who dont play any instrument dont know meaning of the terms chord or key.
Singers often dont invest enough time and effort, they think that talent is all they need. I know many singers who dont have a mic, dont understand how to use a mixer etc.
+1 It doesn't bother me if they don't know the key/chords and theory etc. It DOES astonish and bother me how many singers have NO equipment. Like seriously you don't even have your own microphone?