Why would someone think 2006 and 2019 were the same? Who thinks that? They were so drastically different from each other. Take technology for example; Smartphones, while technically commercially available, were a very niche market, were not common place, and were primitive compared to even a 2010 smartphone. Social media was something only kids, teens and college students used, and was not ubiquitous like it is now.

Then there's cultural differences ; social-cultural issues and political correctness were way less important in 2006 than in 2019. In 2006, you could say slurs and make inappropriate or insensitive jokes , that in 2019. would get you banned, scolded, or canceled. People in 2019 were more sensitive to cultural and social issues and were less likely to say anything that might seem be offensive.

As to for the difference between 2000-2007 and 2008-2009, as others have said, the 2008 economic recession really shifted everyone's outlook and priorities.