Tired of seeing veiled accusations thrown to and fro around here about who is and is not a "true Celtics fan," I want to push people to articulate what being a fan of the Celtics, or any sports team, means to them.
For me, being a casual fan means you enjoy watching the team play, and you identify to some degree with the team. When the team is losing, or playing badly, it's not too hard for you to simply change the channel and stop paying attention for a while, even years.
Being more than just a casual fan means that you have a genuine emotional tie to the team. This is not something you can turn on or off. When the team does well, you feel good. When the team does poorly, you feel bad. Even when you want to stop paying attention to the team, you can't, because you care whether you like it or not.
You feel that being a fan of that team is a significant part of who you are, which is why you feel that your own fortunes in some way rise and fall with those of the team.
For me, being a fan has nothing to do with your attitude about how the team is doing, it is all about how following and watching the team affects you.
What does fandom mean to you?