This really does exist and I’m seeing it more and more in the way professionals like teachers and the government think. That children from poorer backgrounds are likely to be less stimulated growing up. It's the reason nursery places are given from 2 to those on benefits, because it's expected that the child is plonked in a buggy and barely spoken too. Not chatted too or interacted with from birth.
You also get lower targets for children in deprived areas, For example some schools have level 2A as high for 7 year olds, when others have level 3, because a better score isn’t expected from poorer people.
It's wrong Class and money have little to do with the amount children are interacted with and how they are taught.