Luftstalag14
Culé de Celestial Empire
the definition is very loosely, but noone at Bayern would ever come up with the idea that Robben, Alaba or Ribery should be viewed as "outsiders" or whatever you want to call it, just because they were randomly born elsewhere. Ribery is more of a fan-favourite than Götze or Rode is, not just because he is good, but because he kinda loves the club and the fans have recognized that.
Hitzfeld said something about it, but the majority did disagree with him and i also think that his statements were pretty stupid, regardless of what a great coach he was.
Yeah, I agree that Ribery, Robben and Alaba are fan favorites (especially Alaba, I have never met a fan who doesn't like him and rate him highly), but I do think there is an ongoing debate or issue on this, so much so that Guardiola was asked about it today to which he had to respond.
To your point, it is probably mostly tied to Guardiola's tenure at Bayern and the fact that quite a few Spanish and Spanish-speaking players have joined Bayern since he got here.
But again, I have not seen other clubs in other clubs having this sort of domestic vs. foreign debate.