Unfortunately, this stuff does happen from time to time...and it is gross.
My first year of coaching varsity HS in SoCal, we had 4-5 D-1 prospects on our team. We ended up 4th in the nation in homeruns. But the coach before us was terrible and let all of the players have "me-first" mentalities.
Our catcher, who was a sophomore, was jealous of the attention other players were getting, and his dad was an idiot. I was the pitching coach and called every pitch. In the middle of the season, we went through a 2-week stretch where everything I called was getting hit hard. I told my HC I have no idea what I am doing...tried everything, and for him to call pitches instead. A few days later, he showed up at my house telling me he had received multiple phone calls from players/parents saying our catcher was telling all batters what pitches were coming.
He was kicked off the team, but the district allowed him to play for another team. A year later, he pitched against us and a full-on brawl ensued. People need to take this stuff more seriously-it can alter the college/career paths of many individuals.