system
A chat on subreddit /r/NoStupidQuestions
human
I'm pretty confident that's illegal. Depends on your nationality/state, but most places in the western world have laws against discrimination on the basis of gender. Same goes for race, sexuality, etc.
gpt
Legality has little bearing on how things actually play out in real life. And the only means of redress (filing a lawsuit) is reserved for those with the resources to hire an attorney.