But mentioning it as if white people are known for it or did it lots or have a specific history of it is quite racist. Bad things are committed by all races and slavery is certainly one of them. It's whitewashing the world's dirty secrets and then pinning them on the evil white man.
As I've said elsewhere, the context was already about white men employing people from black communities -- go re-read the GP's post, I wasn't the one that bought race into it. I just made an uncomfortable truth that some people apparently feel the need to defend by proxy with the usual arguments of "other people were just as bad", as if that somehow reconciles the atrocities that we committed (hint: it doesn't).
Honestly the "other cultures are just as bad" argument here strikes me just as poor as the "all lives matter" protest comment against the BLM movement:
> There is a difference between something being true and something being relevant.