These are the three steps that empower you when things are going wrong online.
SNAP a screenshot of the content as evidence
REPORT the post or user. All social platforms have regulations about online harassment. It’s worth copying the regulation in the terms of use that has been breached. Send the evidence and a copy of what was breached through the complaints section OR report through the post itself.
BLOCK the user – the post will then vanish and they will no longer be able to interact with you on that platform through that account (some platforms even let you customise this feature!)