It does seem to me that in context of this discussion “abuse” is not just political but also strays into the religious and ethnic.
That may be your reality Sean, but Stone specifically refers to the participants of this procession relating specifically to the widely publicised incident. Stating that those participants in the procession who did not actively intervene should be ashamed. As I’ve amply illustrated it is not clear whether that particular insulting behaviour was, in fact, racist.
It was not a general point that people should be ashamed if they do not intervene when they witness racism. Though, as I’ve listed above, there are human factors which may explain why this does not always happen.
Zero tolerance (of anything) is a nice idea but seldom realistic to achieve.