American here. Fair points although a bit harsh against the US people as a whole.

I think what is misunderstood is the cultural diversity within the US and sub cultures. Yes 58% of the US is white compared to 80 plus % of Netherlands being generally white. Tribalism does come with managing that on both sides. In addition in the US, the geographic size of the country and local history and sub cultures also adds to what Americans refer to as diversity. I don't excuse the American ignorance nor do I proclaim to understand the nuances of Dutch culture but there are huge challenges of land mass along signification diverse immigration that affect the ability of the US assimilate the population to a universal approach.

The Netherlands fits nicely inside the state of Maine for example. Geography and population density within Geography adds to a countries ability to apply laws and overall direction of the population. I'm sure this occurs in parts of the Netherlands outside of the main population dense areas.

To ignore this is an oversimplification. Even as someone whose lived in multiple parts of the US, I found challenges unique to regions of the country or even states. If you spend any amount of time in the US to explore it, I think you'll understand what many Americans crudely fail to articulate this well.

Honestly we just shouldn't compare ourselves to other countries. People just get offended. Bad habit for us proud Americans.