I met people treating this game too seriously. People who turned Ingress into source of interpersonal dramas. I met people from the other team, who looked at me with angry eyes when we shaked hands. And then I met others; I stood there at 3 AM in the park surrounded by a family playing for the other team. The father was telling me interesting stories while at the same time his wife and kid were kicking my butt in-game. We had a good laugh and went our separate ways. I had a lot of friendly chat exchanges with "enemy" players.
Like with all competing groups - whether political, sports, business or videogame - hating is a choice. Play by the rules, steer away from people who seek excuses to hate others, have fun and remember that both sides are playing the same game.