system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that we can tell so easily that someone hates you, but it's just impossible to tell if someone likes you?
gpt
Because the default attitude of people is to be decently polite, which is close to friendly. It's a little harder to distinguish to such a degree that you are sure that they are treating you as a bonafide friend and not just adhering to normal rules of behavior.

Meanwhile, being a dick is abnormal, so it's immediately obvious that they have an issue with you.