I wish there was an answer to this, because I could use it too. Our coach has never said one positive thing to my kid all season, despite the fact that she is the top performer. He yells at her for not trying hard enough, for going out too fast, going out too slow, whatever. He has never congratulated her on a win or PR, has never given her even one tip or strategic plan--not a pace to try to hit, nothing. The only xc race in which she didn't come in first for her team, he was all over the teammate who beat her. He praised that girl, fawned over her for ten minutes, and gave her all kinds of advice about how to do it again.
When daughter told him about an injury that required 2 weeks off as per the doctor, he ignored her completely from then on. Later, after she successfully worked her butt off to get back in shape and stay #1, one day her legs felt like lead and her workout was not going well. Coach got mad and said it was all in her head. He has also yelled at the team for letting the younger girls beat the juniors and seniors, which of course makes the older girls have warm fuzzy feelings toward the girls who beat them, like my daughter.
He also likes to set up these bogus "time trials" in which the top varsity girls are made to run in a pack with the slower girls, yet they are told the outcome of the trial would determine varsity standing for the next meet. So if they went faster than the pack, they weren't team players and weren't obeying the coach. But if they stayed with the pack until the last 100 m. like he wanted, then they would basically be helping level the playing field for their competitors for the varsity spots, some of whom might be better sprinters, namely the fawned-over girl. Luckily, my kid held on to her spot, but the girl who had been second to her all year to that point couldn't finish in the top under those conditions.
I could go on. Is this abuse? No. But it feels bad to the kids.