Homerun/Ejection/Forfeit

[WNCUMP33]

This happened friday night at a high school baseball game in NC.
Team A is beating Team B 10-2 in the bottom of 5th.
Player from Team A hits a 2 run shot over the left field fence. All his teammates come out on the field to congratulate him. The umpire ejects every single player from Team A for coming out of the dugout. Therefore Team B wins by forfeit. There was no taunting or trash talking by Team A, just some high fives.
This is a new rule the NCHSAA has put into place this season. Does any other states have this silly rule and is it enforced by the umpires.