There is on ChessCube tournaments

To each their own method of punishing futility.

It would be rude if you were saying "Nyah Nyah Na Na Nah" and making " moose antlers" while doing so...

I saw that once.

alot of it depends on the timescale of the game. it may be ok to take the mickey in a quick game, with an opponent rated at your level, but some of the examples i've seen on this thread could take years to play out the speed i move at. if you have nothing better to do than promote all your pawns to something less than a rook, you really need to go on a long walk to clear your head.

You have the right to promote as many pawns as you want into any piece you want to torture your opponent for as long as you want.  If he doesn't like it he should resign.   It was his fault for playing badly anyways.

There is no rudeness in chess -- only rules.  As long as you're making legal moves, no one has a right to complain.  I've had losing opponents walk away and let their clock run down (as close to rude as you can get) -- but I still offer a handshake - if I see them again.  Chess is also psycological -- and if racking up a few queens is intimidating, so be it.  As others have already stated, creating your own stalemate is the only potential drawback.

"Rude" is violating touchmove, asking for a take-back, or hoping no one notices that you're castling with a king that has already moved.  (Or crying about a 'mouse-slip'.)

Life has rudeness and rules.

If you consider the promotion of a pawn when ahead in material rude, you should also consider the continued playing of the game on the part of the person who is down in material even ruder.

In blitz it does, especially since he was the stronger player. I've lost better advantages than that in blitz against stronger players like him, which is my point about that being a little too early of a resignation. I'd personally have played on until it was clear there was no counterplay left.

Hey I just though of an even better way.

Not only do you promote all your pawns, but then you sacrifice them 1 by 1 until you have just a king and a rook, and win from there

I think it wastes time, but every player has a right to play as they would like without justification to others. If I wanted to get 4 queens and play around for a few minutes I shouldn't have to justify that to anyone who is not playing the game.

 If you're in a positon to promote multiple pawns, perhaps the question should be: Is it rude of your opponent not to resign?

You can promote all the pieces you want, but keep in mind what will be the quickest path to mate. That's what's really important.

It is not rude to do any legal move which helps you to affect the check mate and win the game.  If your opponent is intimidated by your material advantage acquired by promoting pawns, he may choose to resign or play on, but to insinuate a foul on your part would be considered rude.

Personally, I do the following:

1. When I am behind against a strong player, I resign.  I think it's insulting to a strong player that you think he/she can't win in an obviously winning position.
2. If someone doesn't resign against me, I'll promote as many queens as humanly possible.