Thanks for this. I've avoided this thread for self-preservation because my opinion wouldn't be popular. But, you know me...I'm not likely to keep it to myself forever.
There is such a thing as a kid to big to fly.
It doesn't mean they're overweight or unhealthy. Mine is built like me. I don't think either of us are overweight (yeah I could lose 15) but it still wouldn't make me a feasible flyer. I'm 5-9 and 160. She's built like me. I knew she'd come out of the air eventually when I recognized she could only fly on an older age group. Sooner or later there is no older age group.
So, while I don't understand the context of the coaches comment to weigh in here specifically, my reflection is that coaches are generally in a lose lose situation.
Either they have a conversation in some manner about why a flyer may not continue to fly (and get the "you're calling my kid fat/building bad body image/how dare you") reaction, or they stay silent and eventually take the flyer down and get the "I don't understand why you won't let her fly anymore" reaction.
When a flyer comes down because of their size (and that is legitimate and happens) a coach basically has to decide if they're going to be in insensitive a$$hole or the aloof, non-communicative evader. I think that's a bad position for all parties involved.