That's not my main argument, it's merely a supporting clause.

OP asserted that

white men will treat anyone of any other demographic as less than equals.

I countered that by pointing out that it's obvious that any human being tends to prefer people who they consider similar to themselves. That's my main argument.

And if that is true, then attempting to frame such behavior as particular to white men is just silly and unproductive.

I obviously can't definitively measure the amount of social stigma around white male prejudice, but I don't need to. I'm not saying that white men are definitely less biased than other demographics, I'm merely pointing out that it's a distinct possibility, even as you all indicate that they are the demographic most deserving of condemnation for such behavior.

Now, one could make the argument that even though white men may not be especially biased, the effects of their bias may have greater impacts on other demographics due to the disproportionate amount of power they collectively wield. I think that's a fair point, but it doesn't really hold any ethical implications, it's simply a description of a material reality.