No, you're not overreacting after being harassed like that by someone, let alone a Yehubor.
You do need to heal though, but it seems you're already well on your way, so that's good.
Also, someone else may have told you this already, but I'll say it nonetheless just to make sure, if your username is your actual real name, change it, your identity on the forums should be anonymous for your own privacy and safety.