The phrase “all my greatest mates are metalheads” is a tongue-in-cheek manner of expressing one’s love for heavy metallic music and the tradition that surrounds it. It’s typically used as a humorous solution to bond with different metallic followers and to take pride in a single’s musical style.
There are lots of explanation why somebody may say “all my greatest mates are metalheads.” For some, it’s a solution to categorical their ardour for the music and to attach with others who share their pursuits. For others, it’s a solution to present their individuality and to face out from the gang. Regardless of the purpose, the phrase “all my greatest mates are metalheads” is a strong solution to present one’s love for heavy metallic music and the tradition that surrounds it.