While I get it, I still find it weird that so many British people, including card-carrying members of Labour and British journalists volunteered to campaign for a foreign politician. It's a damaging look in hindsight, and is likely why the US-UK relationship will be dead under Trump, as opposed to tight back in 2016.
With that said, he's not wrong. The US is absolutely not ready for this, and it'll take decades of education and a rebuilding of the Democrats to claw back from this.