I think it's probably that Jeremy Corbyn refused to appear at the state banquet and Trump, pompous and offended, has used the press to make the story appear the opposite of what it was. If Corbyn wanted to play the game, he should have said, "Trump came around to my house and did a poo on my lawn", had the poo himself, and published the picture on every social media site available. Sadly, he's got too much dignity to stoop to how American politics works. I wish it was different. We're so bad at slinging shit. It's almost like we've evolved beyond chimpanzees. Or believe that evolution might be a thing that exists.
Labour leadership confirmed a meeting with Trump during his three-day state visit to the UK was requested and that Corbyn remained “ready to engage with the president on a range of issues, including the climate emergency, threats to peace and the refugee crisis.”
Trump refused to meet. Corbyn said that he would be more than happy to meet and discuss these issues, or anything else, given that Trump is the President of the USA.
Trump used it to score a political point. Smart people will see through it. Bigots will say "he showed him".