I have a friend that does the exact same thing and it is just easily the funniest thing. He'll be talking on the mic saying I don't want it, over and over. Also a big fan of the splatter kills and driving the warthog around. And sometimes for just poops and giggles. I'll have a guest on with me and he'll be on the other team, we both will hop in the warthog and drive while I shoot down his team.

The funniest thing I have ever seen

Sure it makes his team angry but we only do it on social games. When ever they kill me they also get a betrayal so it doesn't count half the time. I don't know just the reactions from the other team are well worth it. The game should really just keep the guest together so this wouldn't happen.