Given the current roster, Cesar is the 2B - because it's really the only position he can handle, and they don't have a more productive bat to push him out of the lineup.
But... the premise of our discussion has been "How do we make the lineup better, by adding... somebody?" If we add a better hitter to the lineup - whether at 3B or in CF - then somebody who is currently basically a starter (Kingery, Haseley, Hernandez) loses plate appearances. So we discuss how we would deal with such a change (e.g., signing Moustakis or Gregorius).
I don't think it's "disdain" for Cesar Hernandez to prefer that Kingery or Haseley not lose plate appearances - given that Cesar is showing signs of decline, given that he will be relatively costly, and given that he'll be a free agent in one year. It's not clear to me that, of the three, Cesar may be the least productive offensively in 2020 - and he'll almost certainly be gone after 2020. I might rather see those plate appearances devoted to developing better hitters for years after 2020 (if there's little to no offensive penalty in 2020 from doing so).
Cesar has been a contributor. But as phans, we have to be able to move on from players - from ALL players - when it's time to do so. Sometimes, it's difficult, because we become attached to certain (iconic) players (and for some reason, sometimes to replacement-level mediocrities like Chris Coste or Sal Fasano?).
I really don't think this one is about his race (although I certainly agree with Philsmania that there are many examples of Philly fans inexplicably souring on certain Latino players - Bobby Abreu?). For me, it's partially about age - does that make me an "ageist"? In the context of expected performance of MLB players, I suppose it does! (Age matters; reflexes decline; this is real.) For me at least, the combination of impending free agency and declining performance metrics (Cesar's OBP, which has been the valuable part of his offense), which are likely related to his age (he's declining at a rate, and an age, that are consistent with large samples of MLB player careers), indicate that, if we add another bat that pushes somebody out of their current role, Hernandez is the likely candidate to be moved.