Other than regularly following Twitter drama or joining some Discord echo chamber, I honestly don't think there is any reliable way to know what is now considered offensive and what is not. The reason why All Lives Matter is considered racist is literally based on some obscure web comic about burning houses from years ago and everyone will get angry at you if you don't understand what the hell are they even talking about. Oh and by the way, silence == violence, so it's not like staying apolitical will help you much.
Is there a regularly updated official list somewhere of newly-considered-offensive words so one can proactively update one's vocabulary?