Yeah, you unlocked many memories of mine. I played CS back in 90s, train with bots and learn map layouts at home, then play team vs team in a club. A bit later with ADSL started to play online and it was still kinda cool. When life fast forwarded me to Quake Arena and R6S it was very fun but I never ever made any online friend. Maybe a couple of people in R6 with whom I played a few times but even then the toxicity outweighed the team play fun.