If its language I wouldn't want my kids to hear, then thats my yardstick. But profainity is in the ears of the beholder.
Saturday in a Girls Varsity game, I wacked a player whose response to a foul call was a very angry and loud "I didn't touch her!" Earlier in the same game another girl muttered sh!t under her breath when she didn't get a foul call and turned the ball over. I asked her if I heard her right, and when she admitted it, I told her to watch the language. So while profanity is a no-no, sometimes the manner of the player is more important than the words.