I think the blog is complaining about a more general thing - that Americans often assume that everone is American and make decisions based on this assumption. This can lead to a range of frustration from the annoying-but-whatever (taxis aren't always yellow) to WTF (dimes, nickels oh-my).

They're currently the dominant culture so it's not an awful assumption - people generally can accommodate and work around these issues. It's just, I dunno, a bit insensitive or frustrating?