What I personally feel about this guy's tactics is not as important as the fact that to any regular Witness, this is a shocking thing to have happen at a Memorial celebration. It's the most sacred thing they do.You could see how angry the elders were with the guy.
The GB will have already heard about this one and will be busy figuring out how to stop such further occurrences. If they try too much security at the Memorial, it will turn off newbies (if there are any!) and inactive ones they are trying to activate. They will have to do something, however.