A week ago ChatGPT said killallmen was used as satire to expose men's privileges. Today it said:

The phrase "killallmen" is not considered satire, as it is not a form of humor that uses irony, exaggeration, or ridicule to criticize or draw attention to societal issues or individuals' behaviors. Instead, it can be seen as promoting violence and hatred towards men as a group, and is therefore harmful and problematic.