I agree with you,It is the polite thing to do. But I also feel that if someone does not want to respond, they should not have to feel obligated to do so.
Bob
For some reason, it is very hard to say 'no' to someone who asks to jam or audition or whatever. They probably have reasons - maybe their style is different, maybe they aren't in your league and don't want to say that.
Rude? Yeah...but God love 'em.
Merry Christmas
Talbot