Depends on the people you play with. The people I found who I play with semi-regularly are good sports. If something obviously hilarious, out-of-the-ordinary, or ridiculous happens, a humorous taunt will usually be dealt, followed in turn by a response by the others. By this time of the game, the stock advantage is already had, and we're even enough in skill that it simply means they have lost, so they accept it.
Kind of like, two guys spend a minute dueling, and that Captain Falcon comes over and Falcon Punches both of us to death. We all have a good laugh about it, and continue playing.
Some of you guys really need to chill. Play it like you want, but don't look down on others because they don't do things your way. This applies to both "Play to win" and "Have a good time" people.