As the first white rap group of any importance, the Beastie Boys received the scorn of critics and strident hip-hop musicians, who accused them of cultural pirating, especially since they began as a hardcore punk group in 1981. But the Beasties weren't pirating — they treated rap as part of a post-punk musical underground, where the do-it-yourself aesthetics of hip-hop and punk weren't that far apart.
Taken from All Music Guide.
As the first white rap group of any importance, the Beastie Boys received the scorn of critics and strident hip-hop musicians, who accused them of cultural pirating, especially since they began as a hardcore punk group in 1981. But the Beasties weren't pirating — they treated rap as part of a post-punk musical underground, where the do-it-yourself aesthetics of hip-hop and punk weren't that far apart.