This picture sums it up nicely imho...
Before I continue, please put aside what you know to be my views on refugees...those are irrelevant, I am answering your question...
Most traditional Labour voters would like to take those signs and shove them right up Corbyn's ass...
Labour no longer represents the lower classes in Britain...they don't want immigration, they don't want the EU and they certainly don't want to be patronised...they hate political correctness and nannying and what's happening? Suddenly the Tories actually look more attractive to them than Labour...plus you have the Centrist UKIP party (the media like to describe them as 'right wing')...
Labour now appeals only to very small set of people that I like to call the new middle class...maybe lower middles would be better...their grandparents would have worked in mills probably but these people now have semi-professional jobs...they're not rich but they've never set foot in a factory or a call centre...they're white collar...they have degrees but probably don't use them in work (psych. majors, political science, sociology,etc, etc.) ...and they have dinner parties and chatter...another way to define them would be the 'new' or 'lower' chattering class...Labour speaks to these people...they are a minority so labour can't win...the end.
How do I know? I spent years being one! I was a senior manager in a housing association...I even drove Mondeos and Vectras and lived in the detached house in the Home Counties village...cloud cuckoo land...