I've been on both sides of this discussion. When I first joined a formerly well-known singing group, my voice was less than great, but I tried. Over the course of a couple of decades, various members mentored me and helped me improve (including lessons in the chorus on stage). The key to it all was that I was expected to make an effort and reach for my best. When my baritone register first came in, I had to take what they had taught me and learn to control/use it and make myself an asset to the group. Eventually, I was offered solos.

On the other hand, I believe the group is/was overly accepting of the trolls who dragged everyone down by performing loudly, out of rhythm and out of key. These people led to the destruction of the group by imposing themselves on us and the (often paying) audience. They insisted on getting on stage with us and dominating one or two microphones. Don't ask me why the sound men did not lower their levels to minimize their effect. Eventually the group stopped being invited to major gigs and now works a only few times yearly, generally without the trolls.