How can I stop replaying the episode(s) of bullying, over and over again, which only make me feel worse?

You have the power to stand-out. You have the power to say no, If it's necessary, it would be better for you to step out of the community/school/work to give yourself space to stand out.

On the level of mind, what you resist persists (for example, try not to think of a pink elephant as hard as you can for 1 minute! You'll see them everywhere!). When bad thoughts come, welcome them and have a cup of tea with them. You'll find that they stay for a short time, but it's far less intrusive than if you fought them. Your inner positivity has so much strength, if you only own it, that nothing can bother you for long unless you let it.

Try to distract yourself with something positive, like reaching out to help someone else, or doing something relaxing and fun.

You can download some meditation apps that will allow you to calm down and not think of anything else

IMO the reason you are doing this is because this person was being abusive and you're trying to find a way to respond to them that will show them that they are wrong and change the bullying. The problem is that their behaviour is outright abuse and there is no way to convince an abuser that they are wrong. They're not interested in a conversation with you to work it out, they are only interested in abusing you. The only real answer is to leave and cease communication with a toxic abusive person. You don't want or need to get tangled up in trying to gain the validation of someone who will never give it to you. You have to validate yourself. So you can replay that episode over and over, but it was never about you, so you will never be able to find the answer, like a cat chasing its tail. Just get out of the ring and refuse to play, including in your mind!