The standard of Engllish a chap speaks and writes marks him for what he is and enables him to find friends of a similar class, status, educational standard and thus, probably, intellect.
I know I go out of my way to exaggerate my accent and use of local slang when talking to people who I think are pillocks as I don't really feel the need to associate with pretentious bell-ends.
Arf, arf!! How I laughed; the only bit that I totally couldn't understand was 'and thus, probably, intellect.' But sure, bejaysus, that's probably just me.