Yes, IME that's very close to the truth. I think that's the “less strong version” of this comment that people were talking of.
The Blueprint Decoded puts it as ‘when you [feel low-status], you don't give yourself permission to [do high-status stuff]’.
(I also seem to recall phonetician John C. Wells claiming that it's not like working-class people don't know what upper-class people speak like, it's just that they don't want to speak like that because it'd sound too posh for them.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.