I'd heard that there were groups like this but I'd never experienced them for myself. I grew up playing a lot of management/simulation games on a very casual basis. As someone who has severe organizational issues due to dyspraxia, I enjoyed but could never master such games, but that's was ok, because single-player is where you get to express your creativity and just have fun on your own without anyone else judging you.
Until yesterday. You have to laugh really, there's no other way to handle that kind of nonsense. It's very hard to rationalize, as a grown adult, the notion that so many people would actively get upset that someone wasn't playing the videogame the way they ordained it must be played. The notion that someone who had never played that version of the game before and whose last experience with Sim City was years ago with Sim City 4 on a fairly casual basis, could play perfectly immediately without any prior experience or indeed that as someone who critiques for a living, I am not allowed to criticize any element of the game and any criticism I do have is actually my fault not the games.
It's safe to say that the subreddit does not represent the majority of Sim City players. Regardless of how obsessive or elitist those people are, the vast majority of Sim City players have always been casual. Sim City is a game with very little stress involved that is highly rewarding, in which you are never really judged by anyone outside of the game. There are no expectations beyond what your citizens and yourself impose upon you and that is a wonderful thing since there are all too many games that insist on pushing you along at their pace or require you to keep up with your team-mates. Sim City is one of the original casual games, but also happens to have great depth, this version even more so do the adoptation of specializations and supply-chain like mechanics from games such as The Settlers and Anno. Unfortunately, that also means you are going to get people that are anally-retentative who claim "YOU MUST PLAY THIS CREATIVE GAME MY WAY OR YOU ARE HITLER". Combine that with the heady and potent jealousy on display in that subreddit last night that someone less obsessive than them had access to the game that they "DIDN'T DESERVE" and you can see why last night happened.
Overall it's a lesson in what happens when fanboys go berserk and yet more in the mountains of evidence that fandom is a ultimately destructive and negative force within almost any scene.