All women aren't like that, but I think western culture breeds an
unhealthy competitive mindset with women. Meangirls is a real thing. I wouldn't say hating but here are some of the things I ecountered growing up dealing with women even into adulthood which is sad:
Another chick might think you are pretty and they think you think you are pretty. They assume you are stuck up and some may even think they need to take you down a notch.
Another chick might have insecurity issues about a feature you have and they envy what you have. Like they envy your body, or think yours is better than theirs so they don't like you, meanwhile you think you look like a whale
Another chick thinks you are popular and wants to be popular so they try to spread rumors about you/ turn people against you. Had this happen in like the first grade
A guy who they like, likes you.
Some chicks are all about competition and they worry about you. If you could care less about attention or are oblivious that bothers them.
They think you get more attention than them and that you like it and/or they want the attention you get. Doesn't matter if you don't like/want it. Its still your fault.
You are new in that environment and they think you will take their shine or something
If you seem happy or carefree all the time. If people like you or say a lot good things about you.
If they assume you think you are better than them.
Some people are very petty.