This place is pretty tolerant of all political opinions. Gamespot is also quite good for being tolerant, although the quality of debate isn't that high. But they did a poll during the 2016 election and found out that their audience was actually exactly 50:50 Clinton:Trump supporters. Very rare to find equilibrium like that.
Echo chambers seem to happen naturally most of the time though. When it's around 70:30 for a particular opinion, the 70% still vaguely respect and are polite to the 30%. When it passes some invisible critical mass at around 75-80%, the majority suddenly stop respecting disagreement and start interpreting it as a problem that needs to be stopped. It's a bizarre defect in human psychology. A lot of people are seduced by a false-consensus. I don't know why. Maybe because it allows you to stop thinking about tough issues.
Neogaf, on the other hand, have deliberately engineered their echo chamber. They've been banning people for having the "wrong opinions" for about 5 years now. It means any political debate they have is essentially just a series of self-reinforcing buzzwords and slogans that essentially operate as a subconscious label for "I don't have to argue this issue anymore cos I know I'm right".
P.S. You're on the internet. Everyone is a foreigner.