From your OG post:
"That most of those cosmetic manufacturers in Asia do not have ANY guidelines to follow by FDA..."
Regulations (word NOT used in your ORIGINAL post) are not "guidelines",as guidelines are suggestive, wheras regulations are directives or statute enforced by law.
Welcome to the Community Forums @Keep-it-rated-G. I'm sorry to hear your dealing with this kind of issue. I know OfferUp has zero tolerance for this and they take it very serious. Contact Customer Care, immediately and our Community Manager @MJ_206 can also direct your complaint.
Keep all communications you've had and don't edit anything.
So sorry to hear about this, @Keep-it-rated-G. We never want any of our community members to feel uncomfortable after receiving unwanted advances. You'll want to report the other user right away - have you done that yet? If so, let me know and I can get some eyes on your case.