But like... why? What is being lost by you arriving slightly late to the fight? You can just pull it off and the fight goes on like normal. It's not much more than a little rude.
It's only bad for DPS to pull when they run away from the tank or if they get someone cleaved (or if the healer or tank are stuck in a cutscene, in which case, lol I guess).
Though, this reminds me of a time I was in an Alexander fight and as everyone was waiting for a cutscene to finish, a RDM was slowcasting, cancelling each time before it went off... but then it did, and I was so startled a DPS was killed in the time before I hit Provoke.