Actual protestors are overwhelmingly high school and university students. But a substantial portion of the population are wearing the yellow ribbon in support of the protestors.
Didn't see anybody wearing the blue ribbon against the protestors. But a large portion of the population are against the protestors and they show their anger. In other words, the protestors are extremely well-organized. They could have actually rehearsed well beforehand. The anti-protestors are not organized at all, just random angry people. Hong Kong government seems to be hoping the anti-protestors to kick out the protestors on their own. Even after most have dispersed by angry people, likely there would be a radical core group continuing to go after the government office similar to what happened in Taipei. So probably there will be a final chapter of tear gassing or rubber bullets and then both sides point fingers at each other about the brutal treatment of 1000 or so "students"