Though the people's profiles here, I've noticed a fair number of guys on ASC are in the Scarborough and Markham region. Defcon Indoors is around that neck of the woods, Victoria Park and Steeles/Finch. I've never been there but the fact that there are always games there seems to indicate its a good field, search Youtube for vids. Between Defcon Indoors and Outdoors (around Downsview Park), TTAC3 (downtown), CQB Paintball (downtown/west-end), there is almost guaranteed a game every Fridays, Saturdays, and/or Sundays.
Airsoft players I find are very mixed depending on age and seniority with the sport but generally open minded. We're always looking at each other's gear, arsenal, setup, and playing styles. I haven't met too many gung ho types but I'm sure they're out there but that sort of attitude usually doesn't last long within this community.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)