As a working-class student at a predominantly middle-class University, I can only agree that the working class, in general, don't know what they need. Why else would they consistently vote for a party which repeatedly sells them down the river through austerity measures, the appeasement of lobbyists, wage stagnation and social cuts? The rhetoric, stirred up by outlets popular with the working classes such as the Daily Mail, of the Tories as strong, good for the economy, and for the people in a post-Brexit world vs. a weak, fractured and unable to cope with the stresses of Brexit Labour, has become widely accepted.
I only have to go home and speak to my family to know that most working class have been steered into voting against their own interests: it happened with Brexit, it will happen this election, and will happen again in 2022/arbitrary date unless Labour or another progressive party find a way to once again appeal to the everyman and convince him/her to put their trust in them.