I think you've put your finger on what's interesting here: that people self-identify emotionally, using lifestyle and value judgements, and not based on actual income or statistics.
The classes are most commonly defined by economists as income brackets, not as welfare vs jobs vs passive income. [1] Yet when people are asked what class they're in, they use welfare and investments as the indicator.
Look at the stats and you start to see that by almost all definitions, the vast majority of the "rich" still have to work for a living, they simply have very high salaries. Passive income lifestyles are only being had by a very very few people well above the median of any "upper class" definition you can find.
It's not surprising that relatively well-to-do people think they're middle class, but it also doesn't hurt to have some perspective and realize that at at household income of $200k, you're in the top 3% in the US. [2] The goal of a passive lifestyle is not and might never be a realistic definition of rich, nor a practical goal for the vast majority.
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Of course, as others have pointed out, it definitely depends on where you live. For more perspective, here are some stats on the cities used in the infographic:
[In 2000] The median income for a household in [Lakefield, MN] was $31,250, and the median income for a family was $37,898. [3]
The median household income in Edina in 1999 was $66,019. [4]
According to a 2007 estimate, the median income for a household in [Scottsdale, AZ] was $70,533, and the median income for a family was $92,289. [5]
According to the U.S. Census Bureau's American Community Survey data estimates for 2008-2012, the median income for a household in [Chicago] was $47,408, and the median income for a family was $54,188. [6]
Real Median Household Income 2014: US=$53,657 Minnesota=$61,481 Minneapolis=$69,111 [7]
That's over 2x variation, but most people would judge incomes of 50k and 100k very differently. *Edit: btw, kinda wierd 3 of 5 examples were from Minnesota...?
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[1] https://en.wikipedia.org/wiki/Affluence_in_the_United_States#Status_and_stratification
[2] https://en.wikipedia.org/wiki/Affluence_in_the_United_States#Top_percentiles
[3] https://en.wikipedia.org/wiki/Lakefield,_Minnesota#Demographics
[4] https://en.wikipedia.org/wiki/Edina,_Minnesota#Demographics
[5] https://en.wikipedia.org/wiki/Scottsdale,_Arizona#Demographics
[6] https://en.wikipedia.org/wiki/Chicago#Demographics
[7] https://www.google.com/search?q=median+income+minneapolis+mn