Rubbing losses in your face

This is absolutely unacceptable. They took an inhib pre-20, our Udyr was having net troubles (which wasn't the problem), but then my team refused to surrender. Kalista was offensive and feeding. Every lane lost. This game was definite surrender at 20 material. It's normal draft for goodness sake. WHO CARES. But that's not really what irked me. The enemy team took the two nexus turrets then just proceeded to kill us for the next 13 minutes. Kalista had Runaan's so they would push out minions, but the enemy didn't finally attack the nexus until they had gotten strong enough to dive us at the fountain and excape without dying. I get it. You won, but that's the most offensive thing that has ever happened.

I know riot talks about rooting out verbally abusive, offensive and afk/leavers, but that's the most unsportsmanlike thing I have ever seen. Cursing at your teammates or the enemy is bad, but not finishing a game and killing people in the fountain while they are NOT defending because the game is just that far gone. That's completely un-called for and absolutely sickening. I reported them all. Didn't know what to report them so I did offensive language since their actions were extremely offensive.