Alt Right

i'll give an honest fast answer:

Republicans tend to support Israel
Alt-right does not.

Republicans think wars and imperialism is good.
Alt-right does not.

Republicans (the establishment) generally doesnt care so much about social issues.
Alt-right does (think gay marriage, mass immigration, etc).

Republicans focus more on money and trying to please Evangelicals.
Alt-right cares more about culture and people.

a healthy percent of the alt-right are misogynists, racists and trolls. But its pretty dismissive to claim that the alt-right is made up solely of trolls. A lot of them are feeling they have been marginalized by society and just want their own piece of the pie. They are voices that deserve to be heard, same as anyone else. Trying to silence them is pretty undemocratic.