But this is where the Pandora's Box of subjectivity opens. Presumably you also think, for example, that you should be allowed to walk up to a Grenfell survivor laughing and calmly say "your probably didn't pay your rent and deserved to die".
So at what point should such behaviour be considered harassment? If you follow them down the street repeating it? Or say it in an aggressive manner?
It *has* to be arbitrary and, therefore, subjective. And what we can and can't post on social media has to be too.