used for emphasis or to express anger, annoyance, contempt, or surprise.
scumbag |ˈskəmˌbag|
a contemptible or objectionable person.
It's appropriate.
EDIT: here's full context per JackWebbHeller's request:
@dhh The Sharebooster site is serving even more images straight off the Highrise server: http://yfrog.com/oddh4zoj . Fucking scumbags.