As far as I can tell this behavior has been allowed to flourish for quite some time. It doesn't seem all that new. Perhaps some of the people who have been here longer can chime in on that.
From a health site image though, Support Forums should foster a respectful exchange. It is totally okay to have differing opinions but to be followed around and be tagged by grump know it all (who really don;t know it all) is not only disruptive for all who stumble upon it but it is annoying for those he does it to. People will just tend to stop posting rather than be bullied like that.
Some of us don't bully that easily though as one bully just found out. When people ban together bullies eventually back down. What they took for granted as getting away with for some time will dissolve as they are stood up to.
Turning the other cheek does not work in the case of bullying.