I respect the guy for doing what he feels is the right thing and for calling their bluff. On the other hand it is provocative and overall would just reinforce the stereotype of apostates being these crazy lone wolfs.
I am not sure how it's done in the US but in the UK we had "attendants" and "watchmen". The former were there to look out for the brothers and sisters, get them seats, ensure their welfare was looked after etc. The latter were the "security". I did both jobs at conventions and in either case the majority were itching for something like this to happen. We were always being prepared for some apostate assault at the convention - which never came of course. At the Brighton Centre there was a ticket office which remained open through the convention and random members of the public would be followed as if they were some kind of super threat. Any known DF person would be flagged up and all the attendants in the area they were sitting told to keep an eye on them. There was a talk on homosexuality one year and since Brighton is a town known for it's large gay contingent, there was a real worry that Brighton's militant gay population would get wind of this and organise a mass invasion of the auditorium. We were all on high alert. All leave (for lunch breaks that is) was cancelled. A line of attendants stretched across the entrances. We were wetting ourselves in expectation. Of course, nothing happened.
In both cases (attendant and WM) there was training on what was permissible under UK law. We were told it was a public venue and that as such we could not prevent access. Touching was a complete no-go area. A person being disruptive could be dealt with but only within very particular guidelines. Route one for someone like this guy would be exactly the same. Basically surround him and essentially intimidate him. When you see it in action like in this video you realise how ridiculous it is. They could have let this guy walk around and no one would pay him any real attention - he would just be "some apostate nutter" to most.
Looking back on it all the "training" we had just reinforced a persecution complex. Doing the job of a Watchman simply was yet another meaningless task to keep brothers busy. I just feel so stupid for buying into it hook, line and sinker...