Ever been a victim of linguistic prejudice, for example if you use an American formal word in the presence of a Englishman that didnt exist in his regional vocabulary you would receive a smuggish comment, such prejudice occurs especially in pluricentric languages and certain words are branded as archaic which has some form of negative connotation therefore unacceptable.
I once was chatting with an Argentine and I mentioned I spoke some
Espanol and he replied with with this look

and mentioned he spoke
Castellano as to seem sophisticated, I mentioned that I found it interesting that such term
Castellano was utilized outside of Spain and that the simple reason
'Espanol' is not used in Spain is because it demeans other Spanish languages such as Catalan, Basque, Galician, etc.