If I am a coach and my team wins 7-0 so it is nearly impossible to reverse the result I would give minutes to the players that usually are sat. If, even with that, my team keeps on scoring I do not have a problem. The other team has a problem. They must improve.
In my country there was a situation similar to the one you descrbe (not exactly the same, here it was the coach of the losers who complained) and I read it in the newspaper!!! Unbelievable.