If I were making rules, I would say:
No texting, no ear buds, no cellphone use, when handling horses, including grooming, handwalking, groundwork, and riding. Period.
No social media or personal calls on the job. But it’s worth remembering that before cell-phones, slack employees hung around chit-chatting to each other or reading magazines in the bathroom, so while cell phones make it easier and more tempting to skive off, they aren’t the root cause.
Also, one thing that teens and young adults often need to learn is, how to do a job. It’s more common now for teens to have part time jobs than it was when I was a kid. But the jobs they get tend to be in the most poorly-paid, poorly-managed sectors of retail and fast food, where they are not properly trained, learn bad habits, and usually don’t last long. So “how to do an honest day’s work” might be one of the things you need to teach kids, in addition to the other aspects of the task.
I’m not sure how I feel about ear-buds while cleaning stalls. The only time I consistently used a walkman (old old tech, I know) was when I traveled a lot, and used it to block out the hideousness of airports and airplanes. I would never go jogging or walking with earbuds; it’s just not safe.
When people are doing a menial job, I am hesitant to remove anything that makes it more pleasant. On the other hand, when I watch friends work with earbuds, they definitely are slower and more distracted. More importantly, they are shut off to everything going on around them, and to the community of the barn and the horses. They are not entirely grounded in the place they are in, which is dangerous.
I would say: no ear buds ever, but supply a radio, maybe one with a usb slot so people could bring their own playlists. I find commercial radio with all its advertisements a bit jarring in the barn.
But I would expect people to have their cellphones on themselves at all times, for emergency contact. They can program a special ring tone for barn manager, etc.
If you want to become good at horses, you need to accept and value the silence and the space to observe and be in the moment. That means not being distracted by other people or by phones.
Of course the barn managers and trainers have to set a good example. If you have the young trainer riding or handwalking horses and on her phone constantly, no one else will see why they need to do it.
The other aspect of phones and social media is that a good deal of the content, especially for younger people, is personal drama. And it isn’t good for the barn atmosphere for people to have to overhear all kinds of heated conversations and excitement in other people’s phone chats.
But then, I’m kind of into … silence.