To be fair, when talking about issues involving more than one group vs systemic racism that uniquely benefits white people above all other groups, then it’s pointless to try and specify every group that isn’t white and is harmed in some way by systemic racism separately. If you want to discuss a common issue shared by various other groups, then using shorthand to refer to those groups as a collective isn’t inherently bigoted. What matters is the history of the term you use and whether said collective generally prefers it or not. A lot of non-white folks use poc/woc/etc and like that it’s a unifying term that implies solidarity with other non-white groups. Some non-white folks don’t like the term, and that’s fine, but it’s still considered better than “coloured people” because “coloured people” actually has a history of bigoted use, hence why it’s viewed as offensive.