This may seem like bait, but I’m asking a genuine question. This happened to my girlfriend where she rejected her former best friend (in a nice way, even saying they could still be friends) and later got insulted, told to kill herself if she was so depressed, and said she never wanted to see her again. Some people say this girl is mean, crazy even, and others say she had the right to say that because she was hurt and my girlfriend should have said yes even though her best friend was a lot less mature and younger than her. They were more like siblings than anything.
No, it isn’t okay to say mean things because someone rejected you. A person has every right to reject someone. You can’t force someone to date you. The person can’t help their feelings, they can’t force themself to want to date you. Being rejected does not call for being mean to someone.