Netdecking is there at lower ranks. Once you reach rank 5 you start seeing people that actually thought of tweaking stuff depending on the meta.
As @Nikkaszal said it doesn't take a genius to do this. It does take however, knowledge of the meta (not hard) and actually playing the game.
There are other websites to check how the meta is and what is T1 and T2. You can use the data to add an ooze a crawler or a crab depending on what you seeing the most.
People can emote all they want, I silence it and move on. If they are ropping then I just watch something else while they are wasting their time.