Perhaps, but also: quasi-feminist efforts to reclaim the word and imbue it with some positive qualities, of which a few examples would be:
• 'Bitch', Oakland- and then Portland-based feminist magazine, launched 1996
• Meredith Brooks' 2000 hit pop single, 'Bitch'
• a boomlet of books with 'Bitch' in the title, ranging from Elizabeth Wurtzel's 'Bitch: in Praise of Difficult Women' (1999) to Helena Andrews' 'Bitch is the New Black' this year
That is, I don't think it's just hip-hop or glamorization of misogyny that's the popularizing/de-taboo-ifying factor here.