[1] http://usuncut.com/resistance/martin-shkreli-gets-poop-face/
I would direct frustration toward you, except I've seen news outlets repeat this. (Then again since you said unabashed, perhaps you came up with this conclusion yourself, in which case I'd love to see your evidence.)
Milo Yiannopoulos writes for Breitbart, which is associated with the alt-right nominally. The alt-right is at its core a white-nationalist movement, but it's not entirely so. Some of it is a rejection of modern leftist values, supportive of Western civilization. This is where Breitbart falls. Milo himself doesn't adopt the alt-right title BTW. Milo is anti-feminist and anti-Islam, but not anti-non-white. He is half Jewish ethnically, and he makes constant vulgar jokes about his sexual preference for black men (and these jokes don't describe him in a sexually dominant position either.) He even advocates for a form of reparations for black people. (Edit: maybe reparations isn't the best term. Basically a one-time special consideration to get them back on their feet economically, education-wise, etc)
Are you confusing him with Richard Spencer?
I wouldn't call Milo Yiannopoulous an 'unabashed' white supremacist. He's an anti-left political agitator, and his behaviour is instrumented towards his personal infamy and profit.
Your comment seems to be merely a way to erroneously connect Shrekli to this, and signals that you think throwing dog poop at people is a constructive political action. There's really nothing more to say in response to this, other than it's doing the Left and everything they stand for a great disservice.
I'm more sympathetic towards an armed uprising (indeed I say desertion and treason as we define them ought to be decriminalized) even if I don't like it. Throwing a shoe at someone or throwing poop at someone's face is not only stupid but a display of lack of strength. The weak usually throws the first punch.
Tell that to all his black boyfriends.