I don't think any single country stands out as having a particularly crazed community. You'll find enthusiasts on every continent and every country; from Finland to Mauritius (shoutouts Adil).
It seems like every country has its tastes though; if you look at the communities in different countries, you'll notice patterns in what they like. Vietnam always sticks out in my mind; those guys love OG Cherry and historical customs more than most.
If I really had to vote for the most fanatical countries as of right now it'd be SEA or China. They're really damn enthusiastic. If I had to vote for the most fanatical country of all time? Korea, no question. They properly started everything, and we owe everything to them.