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Metalcore is more of a masculine genre than others possibly due to the heavy nature of the music. Live performances usually cater to a male audience because of things such as 'mosh pits' 'headbanging' and 'hardcore dancing' these are very active quite violent actions which appeal to more active male fans.
The genre is frowned upon by older generations due to it being a micro genre and the repetitiveness of the genre. Another reason could be the fact that metalcore is heavily influenced by old thrash metal bands such as Sepultura, Napalm Death and Metallica.