I am amazed that no-one picked up on the comment that Rock choirs are run by ''failed musicians". Presumably that makes all music educators "failed musicians" because they are teaching music rather than performing professionally.
There is a lot of other misinformation on this thread, like the fact that you need training to join a choir or even that you need to be a good singer.
There are also very very few professional choirs in this country. Even the big choirs connected to prestigious orchestras are made up of amateurs (albeit with quality control I. e. an audition to get in).
Rock Choir is formulaic, and does sing to backing tracks, which isn't everyone's cup of tea, but it isn't pretending to be anything else. I am not a big fan of the style of singing as I prefer choral music that doesn't have a drum beat, but that's me.
As for the singers all thinking they're brilliant, that is probably not the case, but every good choral director knows that you need to get your choir to look happy and to fully commit to their performance if you want to engage an audience. Imagine watching a choir stand there looking embarrassed or apologetic - that wouldn't do much for anyone.
It might be obvious for my post, but I am a musician, a music teacher, and a community choir director and know how important our choir is to the members, and also how important the quality of our performances are to me and to the members. We have singers who are v musical and singers who don't read music, even a few who can't stay in tune. It is my job to make it work. It is extremely hard work leading a large group like that, and should not be underestimated. It's not a job for a "failed musician".
By the way, have you ever tried making a living as a musician/music teacher - it's not easy...
Roo - you come across as an elitist snob. Pleasantpheasant - you come across as sneering and judgemental.
So, yes YABU, OP.