Well, you know, he's allowed to do that, wrong or right. We don't live a police state....yet.
And rioters are plenty wrong about lots of stuff, they simply don't understand, or have complete access to information on....for instance the actual state of affairs in bronze 5 LOW ELO matchmaking. My account gets trolled every single time I got promos, or start to climb...
(not as much now, because at low elo, the troll is self sustaining, )
...most rioters will just repeat company line which is silly nonsense fairy tales for kids, and I won't repeat here, because a lie told thousands of times still does not equal truth.
TL;DR Riot people don't know everything about every part of League of Legends.