They will undoubtedly talk about gini index, and that income inequality correlates with lower happiness, without any appreciation of other differences between the countries being mentioned. They will have no answer to - and will ignore any questions about - the destruction of people's lives in communist and socialist countries. No understanding that the lifestyle they take for granted is funded by the productivity of the few, or willingness to consider the consequences of attacking that productivity.
Might be interesting to see how they respond to the latest thing that higher earners pay scandi-level taxes and get US-level public services - we've been saying similar for a while, but that crystallises the problem nicely. But they'll probably say we're being selfish, and trot out the usual Labour soundbites about having to make up for Tory austerity, and that we can afford it and they can't.
I'm maybe a bit of a masochist too, because I kind of want the confirmation. But I warn you, it won't be pretty and will likely reinforce your thinking that the UK is doomed. At the start of the private school vat threads, I was hoping to inform: I genuinely thought it must be lack of information making people support something so wrong and stupid. Those threads changed my understanding of UK people and our relationship with the rest of society. Various threads since have reinforced that, although might not have done it alone if I hadn't heard so much vitriol and hate against my family in the education threads. I suppose clear understanding is a good thing - and allows us to make better choices - but it's painful.