FUMBBL is a very wide comunity with a lot of different coaches and playing styles. Often you will come up against people who have a different set of "game morals" to you.
It might be that you think continueing to bash players after the game is won is unfair or that stalling is lame but sooner or later you will play people who feel differently about these issues.

It's important to remember that, as long as someone is playing within the rules, their way of playing is as valid as yours and provides potential for learning even if you don't enjoy it.

The best thing to do if a game annoys you is simply to remember not to play that coach again and move on. There is no point letting one bad experience become anything more than a short irritation by dragging it out. You may find one day your own view on certain tactics has changed anyway.