There are two Labour Parties.
There is the Labour Party of the trendy Metropolitan left, full of lawyers, teachers and various overpaid public sector no marks. These folk have an interest in maintaining poverty, mass immigration and 'identity politics' as it's lucrative managing the client state. The Metropolitan left are not comfortable with the British working class - culturally, socially, or politically - and despise them.
Then there is the Labour Party of the ordinary British Joe and Jane, the 'working' working class and regular middle class folks in outdated shorthand. They are an increasingly excluded bunch in political circles but are still potent enough to put a spoke in the wheel of Westminster politicians. The referendum result was a wake up call as to the power of this constituency.
Corbyn and Labour better make their minds up which horse they're going to ride, as they cannot ride both and win, as this EU thing will expose.