It goes both ways with social media - Fabs (or anyone else) can agree with posts about him and thank them, or as in this case, he can disagree with them and tell them so.
Let's not forget that "trolls" and social media users exhibiting abusive and bullying behaviour have been at least partially blamed for celebrity suicide and mental health issues before now so standing up to them and making a point like Fabs is quoted as doing seems quite legitimate to me.
Most people not on teams (including media) really don't know all the ins and outs and certainly not the details of exactly what is happening in a particular team, regardless of how much some of them think that they "know".
Then there's that "line" to avoid crossing, when it all gets too personal and abusive - such as the situation
here with a defamation finding against a social media "troll".
To me, Fabs has every right to make a point about it - he is not after all some meek little lamb simply copping it - and is in this case making a non-abusive but fairly on-point case.