'Lots of people want to leave the EU.'
Yes they do, but the power elites do not want to leave it. John Major called the Eurosceptics "bastards". The Eurosceptics are a minority in the elite power circles.
'that sometimes people don't like UKIP for valid reasons'
Of course there are valid reasons for not liking UKIP. But when the entire media class and political class try to smear UKIP as racist when they have ethnic minority candidates and are not racist then I think it is because of their wish to leave the EU which does not meet with approval at the highest levels.
'the UKIP policy position'
I am not part of UKIP, so I don't know what all of their policies are. I only know the ones such as wanting to leave the EU, against the "green crap", for proportional representation, for local referenda, for scrapping the bedroom tax, for grammar schools, for lower taxation, for cuts to quangos and foreign aid etc
And I agree with all of those.
'And define populist? Given that most of those who bothered to vote in elections with low turnout chose to vote for someone else?'
A populist party is one that listens to the people and is popular with the people. It is populist because it focuses on representation of the people rather than policies of the metropolitan elite.
Everybody calls UKIP populist, but the elite usually use the term in a pejorative sense in much the same way as they use "fruitcake" to describe ordinary voters. But I see populist as a positive term since it is for the people rather than for the metropolitan elite.
"Britain’s Discontent Lifts Populist Party to Even Stronger Vote Tally Than Expected"
www.nytimes.com/2014/05/24/world/europe/britain-elections.html?_r=0
On Sunday night, you will hear spinners using the word pejoratively all over TV because their worst nightmare is about to occur and populist parties are going to win seats in the EU.
"There will be feathers everywhere".