There are three levels to this.
1) I trade Bitcoin.
2) I'm a long term investor
3) I'm a Bitcoiner
I've seen plenty of people vacillate between 1 & 2.
I've never met someone who used to be a bit...
In my view a Bitcoiner is someone who buys Bitcoin not to ever sell back for fiat, but to hodl (like in a savings account) and (in future, when needed) only will spend Bitcoin for goods and services. That's what I do anyway.