Earlier quoted context omitted.
I agree it is not reasonable to say Milo is a white supremacist, in fact they seem to hate him. This says something, I think, about how the term alt right is used. While white supremacists coined the term, they clearly don't own it anymore. Whomever Milo is the leader of, they don't overlap well with white supremacists. alt-right.
The alt right is a huge umbrella. Milo is a Jewish sodomite who likes to cross dress, so it's understandable some people of the alt right loathe him. He's seen by some as a Trojan horse.
Too huge - Daily Stormer neo-Nazi scum are exactly the same kind of problem for the alt-right that NAMBLA used to be for the gay rights movement.