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That's a story for another thread as you said, but:
I mostly agree with you. The concept of teamwork and teamplay is very attractive, both for the players and the viewers. Through the miracle of internet gaming, people play together, win together and rape each others mothers together. This is a fact, but things are a little different in CoH2.
As I said, the concept is very interesting, but the practice isn't especially in CoH2. I myself exclusively play 2s. Used to play 3s and 4s but haven't played those modes for a long time. The amount of people playing 2s+ is stunning as you mentioned, which also means the "number" (not the percentage) of noobs and scrubs is a lot more, which might lead people to deduce that "K DEN, TEAM PLAYERS ARE ALL N00Bz". This is the major reason-in my humble opinion-why people are picking on team players.
But there is another major issue. In practice, CoH2 is not suitable for team games. Now don't get me wrong. Yes, a lot of people play team games and they are content. If you enjoy something, good for you, no one has the right to pick on you. But still, CoH2 has major flaws regarding team games.
First, the game is not "Team Game Friendly" by today's standards. No dedicated servers (Disconnect and GG) and not report system (although in process) are two examples. The performance is also... Sigh...
Maps are not balance. I still wonder, how did we endure Face Off in 3s+? The amount of variety in content is also very limited. Look at C&C General, a lot of factions with different strats, Dota and LoL have literally tens of champions with different play styles. In coh we have 5 factions with stale meta. All these aside, we have these Relik moments when they release a patch and give a faction the chance to hit 100% win rate...
I'm not really sure why I'm writing all of this, but these are just my two cents on why people talk down to team players. TL;DR : Team games in CoH2 are mostly tutrle/arty fest, without any tactical value since most people play four 1v1s in a single map. And you have to exploit the balance to win. This frustration is the reason why people disregard team players.