I'm going to tell my ex-girlfriend off and then put her on blast online
Why do you want to put her on blast?
I just want to hurt her feelings a little bit.
It is normal to want to get it off your chest when you are upset but sometimes you can put things online that you don't mean when you are angry. Then you will regret it.
I'm an adult and I'm not going to hurt myself by saying something I don't mean.
If you don't think you would regret it then what about respecting her feelings? She doesn't deserve to be treated this way. You should move on from the relationship.