So now at least we know where the slogan came from.
The gentleman in the video is Neil Nguyen, an attorney. His Vietnamese name is Nguyễn Xuân Nghĩa (not to be confused with the isonymous but better known columnist for Nguoi Viet and Viet Bao daily newspapers).
Just a couple of weeks ago he and his non-profit organization were marching in the Tet Parade without carrying the yellow flag, and immediately afterwards were accused of being commies. (If you can read Vietnamese, click here.)
Maybe this is his way to redeem himself or something….

Chau, I did not call you a commie or pro-commie. That would be wrong. The major difference is my joking around, while people’s reputation are being destroyed by the few idiots accusing others falsely.
Bolsavik supports B. Doan’s right to display his work and mocks the protestors, but he also supports their right to protest as long as these indivduals do not break the law. If Mr. Bolsavik were to deprive these individuals the opportunity to express their view, then he would not be any better than the people he writes about, right? Go to all the Register articles and read his interview. You will see proof.
Good to hear from you, Chau.