Everybody has a different definition of what it is to be a biker, doesn't mean someone has the true definition or is more right than others, it's what you make of it.
Some are indeed real snobs and call you a week-end warrior if you don't go to rallies or haven't been part of an MC.
Liking racing or knowing everything about bikes or mechanics doesn't make you a biker either in my view.
To me, a biker is someone who rides their bikes for their own pleasure and/or necessity and not to show off, like Sunday power rangers....