I think it's a bit heavy handed personally. Players aren't told to show respect to their country's national anthem in a specific way, why should they be instructed to show their respect for BLM in a specific way?
And a raised fist is the sign of Black Power, isn't it "cultural misappropriation" for white people to do it?
This is where contemporary social justice political movements are not even 'like' a religion anymore. They have BECOME a religion in all but name only.
Remember in the middle ages, to be charged as a heretic, you didn't even need to be a non-believer. Not following dogmatic positions in their entirety, or not worshipping in exactly the correct inflexibly prescriptive way - complete with mandatory performative rituals - was enough to be charged as a heretic.
In this context, QDC's mistake is going about his commitment to racial equality with humility and humbleness in his every day life. He doesn't expect kudos and recognition for it, he just does it. Once admirable qualities. But in a world obsessed with narcissistic attention seeking and a grotesque contest of moral exhibitionism - a phenomenon driven by social media which essentially exists with grotesque exhibitionism and attention seeking being it's central raison d'etre - people like QDC who quietly exercise their beliefs in their every day dealings and interactions are sadly called into question. And worse, essentially assumed a non-believer (in this instance, a racist) because they don't express it in an inflexibly prescribed way.
As to your point on cultural appropriation. Well this is one of the many examples of contemporary social justice politics being riddled with so many cleverly crafted double standards, designed to put people in a no-win, check mate situation, where they have no choice but to admit their irredeemable original sin (in this case, being born white) and bow down and lay themselves at the mercy of the unelected social justice clerisy. As in, on the one hand you must embrace multi-culturalism, multi-racialism, multi-ethnicism by overtly celebrating it at every moment of every day, but don't embrace it too much, because that is cultural appropriation. The inference of course being that part of your original sin of being born white European is that you actually have no culture, every part of what you think is your culture has been appropriated (stolen) from some other group.
As others have said though, probably best for another thread as this is more politics and philosophy related, rather than specifically cricket related.