Wait. . . . did you just say that they failed the second boss, then had to go at it again? So, why didn't you join them for the second round, assuming it was a full wipe?

If you're actually saying that you were still chest hunting by the time they died and were returning for a second fight, honestly, I have no sympathy for your kick. While it's wrong for anyone to be kicked if they aren't intentionally harassing/cheating and are simply enjoying the game content, at the same time and please correct me if I'm mistaken, you make it sound as if you were on a treasure hunting spree while they were preparing for the second round, instead of being ready to go in and participate with them, thus preventing progress. . .