> the left have lost touch with the lower classes

Nonprofit museum/library techie here. Anecdotally, if by "the left" mean supporters of Democratic establishment politicians, this is very true. They're doing well enough for themselves that they're insulated from economic bumps and they just don't seem to care about the things that real working people do. Real leftists and progressives get it though, which is why politicians like Bernie are so popular with working class people.