It's kinda hard to say when it's okay to do tbh, if at all... Simply because the moment of sweet vengeance isnt just wasting that one person's time, but your entire partys. So it's like... Yeah a great tool for that but we probably shouldn't.

Honestly if I ever wanted to waste a specific person's time for being a jerk or something I've always just kicked them. It almost always will pass(especially if it's a DPS) and... That specific person has to queue again
Was it a DPS? How long did they wait in queue only to start harassing people while in dungeon? Well, now they can wait again.

If it's a healer and I'm feeling especially vindictive I'll hold off on the kick until right before the final boss. >x>;