Biography
There are at least two artists/bands with this name:
1) An extreme metal band from Belo Horizonte, Brazil.
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2) A death/thrash metal band from Friedrichsdorf, Germany.
1) Insulter was an extreme metal band from Belo Horizonte, Minas Gerais, Brazil, formed in 1986. They released three demos and a rehearsal tape before stopping their activities in 1989. Around August 1987, many of the band members would unite to form a separate band called Sextrash. In 2015, the american label Nuclear War Now! released a compilation album named Blood Spits, Violences and Insults, which compiled all the band's available recordings.
2) Insulter is a death/trash metal band from Friedrichsdorf, Hessen, Germany, formed in 2005. They released two albums, Crypts of Satan in April 2016 and The Misanthrope in February 2018.
Biography text from Last.fm, available under CC BY-SA.