Are you ashamed to belong to the same race as Nazis if you're white, or Mugabe if you're black?
Are you ashamed to belong to the same faith system as most of the Soviet elite and Bolsheviks if you're an atheist, or King Leopold II of Belgium if you're Christian?
Are you ashamed to belong to the same nation as slave-owners and genocidal maniacs if you're American, or frankly most other European nations?
The people asking these kinds of questions are not honest. Every ethno-national group, every religious group and faith system, has been associated with violence. It is only the bigot (and everyone who answered "Yes" to this question is a bigot, no matter how they rationalize it or how subdued that bigotry is) who holds people accountable for the behavior of some arbitrarily defined group. Does every Republican in the U.S. have to prove that theyare disavowing Trump, "white ISIS"? It's also blatant hypocrisy in the Biblical sense, in that it evinces a mentality that would rather throw stones than work on one's own sin. No person is perfect and no group is perfect. People with integrity work on that instead of asking if other people should be ashamed.