Not necessarily, many of them are fine with Africans, Muslims, Jews and so on (I know I'm lumping race and religion into one here). They just want them to stay in their own country, if they insist of preserving certain parts of the culture. You want a country rules by Sharia that's fine, with most of these parties, as long you don't try to do it in their country.
I mostly view it as how apartheit wanted to be viewed: Tolerance and acceptance of each others culture, but clearly separated, in this case in countries.
It's really that simple. Trump give them hope, let them see themselves again as someone with the potential to be something again.
Bernie basically says. You already lost but I am going to make your suffering a little less problematic.
Trump is specifically popular with men.
Nothing groundbreaking in that.