You cannot refute their number to them, because their standard is totally up to them to set. Without delving into the details (not going there, thanks) I did note that it is reported that they claim "only 3 percent were the true patriots" and if that is so, then since it is entirely up to them what they consider "true patriots" there is no convincing them using any one else's numbers, factual or not.
Apparently, they are in their own little world and reality isn't allowed in their ideology.
You can find this level of extremism in every political philosophy and religion (assuming you make a distinction between those two
). Thanks to the information age, we now have the joy of hearing about them and what they say, even when we're not interested.
based on what I've heard, and read and believe, about 1/3 of the colonists favored revolution, 1/3 favored remaining Crown subjects and 1/3 just wanted to be left the hell alone to get on with their lives.