Toxic lobbies and being held hostage for LP

I had a player in the lobby queued as a support. Immediately out of the gate he says, "I'm going adc, no matter what" I was queued as adc and was first pick so I picked cait and he starts flaming everyone. He eventually picked jhin and I knew what this game was going to be like so I was forced to dodge. Excluding all of the slurs and language he was spewing, why is this continuously allowed to happen in a ranked game? I'm getting punished with LP and get to listen to this guy call us names with no repercussion as there is no report button for the lobby. [img][/img]
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