Like I said, I don't agree with much of what he says. I can see why it's popular, though. It's the inevitable backlash of the modern day PC world, and now we've gone from the extreme where we can't raise the St George cross on St George's Day* to where it's okay to say that all Muslims are evil and need banning. People are like children: Tell them not to do something (i.e. vote Trump) and they're more likely to do it, just to spite people.
For absolute clarity, I think the guy would make a terrible president and neither would I like to go drinking with him, as I think his views are wholly out of touch with a progressive modern society. However, I can also understand why some are voting for him in their droves.
*I know it's a complete myth, but it's an easy example. Apologies for the laziness.