Credibility matters. If you have no credibility with your audience on the topic at hand, then your sound evidence will go unheard. It's not an issue of "should" it matter, but rather that it does matter. That's reality.

https://en.wikipedia.org/wiki/Ethos#Rhetoric

If your credibility is determined by your skin color, that says more about the audience.

Well yeah, it's the audience who gets to determine how credible you are, by whatever (arbitrary and/or misguided) standards they choose.

As someone speaking to an audience, it's your responsibility to determine if it's worth your energy to engage with them. Sometimes it works out even in the most bizarre circumstances. https://en.wikipedia.org/wiki/Daryl_Davis

Who decides whether or not evidence is based and sound?

During the slave era, white slave owners believed they were doing good for the black man. That this was their optimal role in society.

If you are not the oppressed, you cannot objectively be part of the discussion about whether or not and how the oppressed are being oppressed. It's quite simple. The only thing you can do is help. If you argue against their oppression, you are perpetuating the structural inequality.

In a nutshell, everyone is oppressed, in some way.

You can be oppressed and be an oppressor. There's something to be said for how and why, but weighing them against each other is nebulous. This has been true throughout history. re: israel-palestinian, hmong-vienamese, english-scottish, etc.

> If you are not the oppressed, you cannot objectively be part of the discussion about _whether or not_ ...

I don't find this assertion is sound. There's an element of ideology in there, which I appreciate, but I do not agree on this practical tenet. If it was rephrased or attenuated to a more specific decisioning system (ie the latter part of the statement, is more palatable, albeit also something I don't fully agree to), I would re-examine it.

Genuine question, where have you sourced this line of reasoning from?

Look up the concept of "natural slavery".

Not cool. We've banned this account.

So, just because some men had a crappy idea — at the same time people also thought the earth was made in a week — every white man who ever lives is now precluded from an opinion. Dear lord.