[Cub42]

It sounds as if your assignor failed to give you a strong partner for your first Varsity game. The higher level of ball you do, the more important Game management is. Coaches will get away with what you allow them to. Here is some insight to what you posted:
1) First of all, if there is any interference call at second, it is yours, the PU. If your partner ruled he didn't touch the base, that is totally different than Int.
2)After the H/C asks his catcher where the pitch was the 2nd time, and he makes a comment back such as " It's right there", call time and sweep the plate. Inform the catcher 2 important directives. Tell him the next time he trys to show you up it will be the last time, and to inform the coach the same thing. Now is a good time to issue a warning for arguing balls and strikes.
3) This is HS BB and coaches are responsible for the players, Asst. coaches, and their FANS. Any profanity shouted from the stands should immediately brought to the H/C's attention, and he should be told to get them under control immediately, or they will be removed. If you know who used the F bomb, have them removed by Game Adm.
4) As for a strike called on a bunt attempt, there is no appeal if you ruled he went.
5) Finally, learn from your mistakes. Don't ever let the coaches turn the focus of the game from the players to the umpires