You write from a perspective in which Labour is the only party entitled to anti-Tory votes. Perhaps you don’t see it that way, but I am certain this is a part of what has turned people away from Labour. Your dismissal of the 1.1million Green voters is particularly haughty and shows an undemocratic streak that I, and I’m sure many, find distasteful.
I’m as eager as anyone to see the back of the Tories, but I’m not a lover of Labour, even under Corbyn. If, instead of writing this from the pov of the Labour Party, you had written it from the pov of a putative Progressive Alliance, it would have been more acceptable. A time-limited alliance between progressive parties aimed at defeating the Tories, with an agreed but limited program for government, and in which the interests of each party are protected ready for the end of the alliance when PR will decide future governments, is the ONLY way forward. If you find Greens, LibDems, SNP or Plaid Cymru members so annoying, you’re going to have to hold your nose anyway if your party is to have any chance of a sniff at the power it craves.