I'd say it was in keeping with the subject of the video given it was a mental health issue. It was also clearly a spontaneous reaction, it's not like he could have planned it. I don't think anyone has the right to tell him the right way to deal with his problems.
As for Robinson not having the right of reply. He has the support of the club media department, the use of the club media channels and he is interviewed by the BBC, STV and the biggest selling newspapers in Scotland multiple times a week.