If you believe that ......
Inequality is a matter of opinion, homelessness is a matter of opinion, food banks are a matter of opinion, housing shortage is a matter of opinion, the north/south divide is a matter of opinion, massive underinvestment is a matter of opinion, poor productivity, low educational attainment, short term capitalism, exorbitant executive pay and job insecurity are matters of opinion.
Then I struggle to see how you can know anything about "a fair old chunk of Labour support"
I struggle to see how you can claim you know better.
Everything political is a matter of opinion.