The family of 9 from Belleville, IL. Specifically, the one who yelled at us for switching their tour time to an evening tour when the heat index was 109 during the day. Even more specifically, the guy in the family who said "What, is the Obama administration now trying to regulate when we can take bike tours?" Who was the same guy who passed an Indian family on the mall and yelled "Welcome to America!"
It disgusts me how rude and ignorant people (especially Americans) can be sometimes.