LDK or Fury imo..
LDK for being infamously dubious in their playstyle. I must admit I will never believe that they play fair, furthermore they were very successful which tends to piss people off
Fury for being annoyingly successful, also their leader Syn_Sid has for some reason always been easy to hate. I remember way back when; I didnt really have a reason to dislike him, yet I did.. Strange