Well, how much would you have to support or like bitcoin to be considered on the side of bitcoin?
Conversely, how much do you have to dislike bitcoin to be considered a detractor?
What about the people without strong opinions? People who like bitcoin but not fanatically? Or people who don't like digital money but still use it because its there? Are they true supporters and haters?
I don't think there is a hard division between people who like bitcoin and people who are against. It's a synthetic proposition.
Then it would follow that the Dunning-Kruger effect claim is a synthetic proposition as well.