While it is true that the sources cited for this are not valid for anything other than watching the antics of the pseudo fascist fringe group, it is good to identify code switching as very common in diverse societies. This is only a threat to those with no code to switch, e.g. white supremacists.
All of us who live in active and diverse societies code switch constantly. These folks should try living in Hawai’i where we code switch continuously between languages and our own range of dialects all of which are local kine talk.