system
A chat on subreddit /r/PoliticalCompassMemes
human
It depends. Most discrimination is legal. However, you cannot discriminate based on protected classes, in which case you can’t say no on the basis of race, religion, sexual orientation, gender identity, etc.
gpt
i think for public accommodation, race, nationality, religion, and disability are protected at the federal level. states might have additional ones. employment has more though