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I agree with you, and I think the half of the country that voted leave are insane for jeopardising - maybe destroying is a better word - that standard of living. The British economy is, sorry, was, doing well.
@Skydancer is right though, this is about relative inequality. Just look at the list of areas that voted leave in order of majority, all places that couldn't be further from us remainers in London (either literally or metaphorically) and who have not benefited in the same way we have.
It's relative gap between rich and poor rather than standard of living that is the problem. It's also the relative difference in investment in infrastructure, of schools hospitals houses transport in different areas in the UK.