guido
(n) someone who betrays his/her ancestors by living in a way that makes their culture/origin an object of ridicule, and/or is an embarrassment to people of similar descent
"That guido is the biggest embarrassment to {enter race/ethnicity here} since {enter calamitous event that shamed said race/ethnicity here}." aka... "The Kardashians are such guidos - the Armenians haven't had press this bad since the Turks drove them into the ocean....100 years ago"
By dégoûté