Its not just Korea were new players or even older players experience mobbing, I think you will find it on every realm to sum extent.
It states that he is an older player throw rather new to the game.
As you get older your reaction times go down and even if you know what your supposed to be doing and have descent gear you find it hard to keep up with the youngsters, I will hit 50 sooner than I would like
What surprised me was that he exposed himself to realm ridicule throw doing random groups and didn't just stick to a close group of friends that knew his limitations and were willing to help him ie hide in a guild like probably a lot in his position do. I think we have a couple in my guild, nice ppl but struggling and needing a lot of coaching.
I would not be surprised if to a lot of players young and old that LFR and LFG is pointless and after maybe one or to goes at it would never dream of pressing that button again just because of the atmosphere they meet each time. Not every one has Kevlar skin.
Mobbing probably dose more damage to the game than any of the so called competitor games.
It would be interesting to know how many invisible players blizz actually has (players not doing random BGs LFR and LFG).