Is it okay to report people for griefing when they don't accept a surrender vote?

Every now and then I get these games where by 15 minutes, the enemy team has a considerable lead, like 30 kills to 10. You know you're gonna lose and there's not much you can do about it, but it is still going to take another 15 minutes for enemy team to actually get to your nexus so you can go on and play another game and then there's this one guy on your team who just doesn't want to accept a surrender vote, keeping the 9 other players 'hostage'.
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