There are two tests one must pass to join the Cristiano Ronaldo fan club.
1. Cheer every highlight of him, no matter how small, like it is the greatest play ever.
2. Boo anything Lionel Messi related.
The stronghold of the fan club appears to be at Sporting Portugal, Ronaldo's boyhood club. And it is strongest among the children.
I do not know Portuguese, but everything in that video is roughly translated to "suck it, Messi," which also happens to be the fan club slogan.