I can 100% guarantee you that it has been done, and it was yelled at me. It was right before the second half throw in, and I just yelled “let’s bury them RU!” The referee actually laughed as he handed the ball to the opposing player.
It's funny to watch grown men bellyache about penalizing a young man's jerk behavior during a game, aimed at the crowd no less. I didn't like it, immediately thought "jeez, he may get teed up," and then he was. And it almost blew the game. Go ahead, if you like, and call it sportsmanlike and cite all the reasons why it shouldn't have been whistled. I ain't. Grow up young man and don't do it again.