The Sun and co have a very peculiar idea of what left wing means - basically, if you don't think Boris Johnson is the saviour of the British People, then you're probably a communist. It's the new political way, learned from Trump. Attack everybody that disagrees with you, call out all opposition party members as evil, racist, stupid, and working with the devil/IRA/Russia etc. Even the press (not RW though) are declared corrupt, fake.
I wish people would stop falling for the BS. If you read tabloids you'll never know what is going on in this country. All tabloids just make stories up, that's why they hire more creative writers than journalists.