Good one Big, lol, personally I think unless you are leaving your starters in the whole time, and not giving your reserves an opportunity to play and get some experience, then it is up to the other team to stop you. It is not AYSO, it is competitive, unless ofcourse you are just trying to let an All State Player run up her goals scored totals.
I would Congratulate the Coach and the team for using their reserves, and still playing the game competitively.