@inquiline yeah, the libertarian mindset is strong here...
'Oh, you are posting publicly, free real estate for me. If you don't want this why are you posting publicly then?'
Only because it's public doesn't entitle you to do with it (and me) whatever you want. In the end it's all about consent, yet again and again and again.
@inquiline Social media conversations should be no different to any other conversation, especially as no visual cues as to whether someone is upset or not by what is said. Politeness costs nothing.