Is it okay/normal to say mean things to someone's face because they rejected you?

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…

Okay? No, never

Normal? Depends on what you consider normal. I would say understandable, for sure. But also petty. Sore loser. Most people wouldn’t. If normal for you is something that happens frequently and expectedly, then, no.