the question looks perfectly straightforward to me: Nigel, Boris and Trump all play on populist dissatisfaction with what they like to think of as political elites who have ignored the average voter, so how can you support one and belittle another?
The answer however, at least here on AB, is that those who support Farage also tend to support Trump.
Just listening to someone on Newsnight stating categorically that Trump has a 100% pure record on employment equal ops. for women. I don't belittle Trump at all although I deprecate several of his utterances. I greet with some suspicion all these historic allegations of bottom-pinching etc.. He is certainly a very, very far from perfect candidate for the presidency - but Clinton is unthinkable! How the US got itself into this position is a mystery to me.
I don't think it's fair to lump Johnson in with the other two when it comes to claiming to be anti-Establishment. A lot of people associate him with those views because he is rather unconventional as a politician like the others, but not sure he claims to be 'taking them all on' the way the others do