As for your kid being bullied, you need to be all over that issue as a parent. No kid should have to endure it as the price for attending school.
So I do think it's bullying, unless you're going to address the substance of the argument rather than its tactfulness.
Now, regarding the rider for speaking engagement, I would agree that the outright mocking seen there was uncouth.
Deleted comment
Deleted comment
In other words, if you want to argue against raganwald and Dave Winer, that RMS should be ridiculed, you need to come up with something that logically supports that, not just assert "Dave Winer is a bully also". This assertion does not advance your argument.
Deleted comment
http://www.paulgraham.com/disagree.html http://en.wikipedia.org/wiki/Ad_hominem
I used the expression specifically because it has been much discussed here on Hacker News. Another of historical interest is:
А у вас негров линчуют
[edit] This relates to your point because you are literally one click away from knowing the definition of such phrases. It is no great burden to ask that you occasionally Google phrases that people use, especially when there is not better way of saying it.