Seen several "put content warnings on politics" posts and I don't know how to tell white people that 90% of all life is politics. You're asking people to hide the stuff you find unpalatable and that's not a reasonable thing to expect other people to do for you.
The term content warning is a bit outdated. The purpose has evolved. It's not only used to hide unpalatable things. It's generally used to indicate items your followers may not be interested in. For example, cat pictures. It serves as the equivalent of a subject on an email. It allows the uninterested to ignore posts they are not interested in. I don't have an ego that would allow me to assume my followers are interested in every subject I post on.
Its a courtesy, not a warning. It use reduces the length of the timeline and possibly server load (pictures especially.)