Gatekeeping prevents both musical exploration and exploration of genres in general. Just because somebody has different tastes from another doesn't mean they can't get into new things at the same time. For me the true definition of a poser is somebody who likes the imagery of something rather the true entertainment involved. If somebody likes a genre outside of the standards, they can like it, if a person likes a polarizing or different album, they can like it.

Well those balls got emptied once Napalm Death came along.

It's OK to have different opinions on how to classify certain styles of music. The problem is people who say, "You're not a true fan unless _____."

It's a necessary evil, I think. You need to keep trouble makers and rogue elements out. Ban hammers exist for a reason, right?

I think it is also okay to not want to be associated with certain ideologies. I don't think anyone should feel bad for disapproving of NSBM bands, for example.