It’s fine to be frustrated and even (reasonably) critical when things don’t go your team’s way, but if you talk **** to your own team instead of supporting them win or lose, you don’t get to enjoy the victory as much as fans that ride with their team no matter what. That’s not my opinion, that’s just the way it is. The joy of victory is directly related to the pain of defeat, and if you choose to abandon your team in defeat out of your own insecurity, the victory isn’t going to be as sweet.
And it’s a cop out to say “fan is short for fanatical” as an excuse for **** fans. That’s not an argument when there are plenty of passionate fans who aren’t so insecure that they have to talk **** when their team loses. You’re not more of a fan because you have personal insecurity issues that have nothing to do with your team.