What would you do if your ex was talking shit about you on social media where there are a lot of mutual friends you have? Im talking about saying really fucked up embarrassing things like telling everyone you abused steroids and you couldn't get hard anymore

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They say the best thing is go on and live a happy life and that's what I've been doing. but I really want to send this bitch a nasty ass text message. something like
"you pathetic c u n t. The fact that you go out of your way to bash me on social media four months after we broke up just shows you how much you still want me. I hope you realize telling everyone a guy couldn't get hard with you only makes YOU look unattractive to him, you do realize that right? Go ahead keep talking shit hun, doesn't change the fact that you were , still my rebound girl who i kicked to the curb cause you were shitty in bed, had shitty tits, and a loose ass pussy"
I hate being in this situation because I know I could say something like that which would really hurt her, but part of me knows how fucked up this bitch is...me contacting her again even if it is to insult her, will only give her validation. She's bitter Im not crawling back to her like her other exes.