Actually, while I do think that Arteta's "people" skills could do with some attention,
@Alphazoid makes a fair point about perspective, and how the fact that Ramsdale is English seems to serve to render his treatment worse in the eyes of some commentators and media (and rather intemperate fans).
Klopp (who is famously empathetic) replaced Karius rather briskly after the disaster of the latter's egregious errors during the 2018 Champions' League final, - a debacle from which no return was possible - while, earlier still, almost Guardiola's very first action when he took charge at Manchester City was to discard (and replace) Joe Hart.