@Marissax510I am sorry about your negative experience. It is annoying but try not to let it bother you so much. Don't allow them to have that power. As for me, I will not conduct business with anyone with such inept social skills.There is not a location safe enough for me to meet with them.
OfferUp is doing something. If you ever come across someone who is acting inappropriately to you and won't stop, please report them so our Trust and Safety team. They can look into their accounts and email them a warning, or block them if need be.