Post-hardcore has a similiar fanbase to metal these days though is the point.
Not if you're talking about real metalheads, I've never heard of a post-hardcore band touring on a black/death metal tour for example.
I would add that being a headbanger is very much a psychological phenomenon. While death and black metal are by no means the end-all-be-all of the genre, they display an ethos that appeals to the typical fan of the genre in a very basic sense. Saying that post-hardcore has a similar fanbase to metal would have to imply that fans of post-hardcore would be attracted to the deliberately offensive usage of violent and Satanic imagery associated with the metal genre. I sort of doubt that, though it's not like I know about post-hardcore.
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