I dont think any of those groups really go around saying that they are metal. Theve probably all been labeled "metal" by others. besides the most metal thing you can do is your own thing and dont fucking conform to everyone elses mold. Metal was created by society's outcast (not the stupid rappers). Nowdays it seems like metal has become a conformist paradise of of elitist fuckheads who have become just like the elitist groups that they should all be standing against. The real posers are those who call others out for being so.
Now EMO is not metal its whining, and very much equivalent to the hairbands of the 80's its a flash in the pan.