Section's right in that I imagine he's toxic waste in the Home Counties, but the mad thing is that his policies resonate there, even if 'Labour' or the entire concept of 'socialism' don't. That video Gyles Brandreth did for the One Show in Guildford is well worth checking out on YouTube. Admittedly it's not a rigorous scientific study, hence it being on the One Show, but it's nonetheless interesting to see him read out a list of Corbyn's policies to people and have them agree with what he says, only to recoil in horror when it's put to them that they're espoused by Corbyn.
It's one of the problems with this country in how tribal politics is, as opposed to being something to be internally debated and formulated organically. On the flip side, it's similar to how a section of people on Merseyside and in the north parrot the 'all the family vote Labour' and 'they're the party for the working man', without giving much thought into what it means and actually come out with some socially conservative (small c) stuff that occasionally strays into hardline rhetoric, hence the Brexit vote in the Labour heartlands.