Bloody hell, do they not see this sort of thing will show them in a bad light?
In the olden days (not that old, 90's and early 00's), if there was a meeting we knew we would disagree with the thrust of, and it was important in some way, we would produce a leaflet, hand it out outside a meeting, then go to the meeting, listen, and make a comment at the Q&A. This was generally the done thing. I am not in the UK, but pretty sure it was similar over there.
The only time you would be in any way disruptive was in very limited and specific circumstances (and not at community meetings such as this). Crazy. I am so glad they got this on tape.