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I disagree. This happens in real life, poor people often live a lifestyle that they cannot afford. Whether it’s having more kids than they can afford to raise or living in an apartment that is above their budget, poor people often find themselves in situations that keep them in debt. The image in the OP depicts a reality that is common in every part of the world. Give a poor man a small fortune, and he will suffer from imposter syndrome. A poor person who just made a little money will spend it all trying to look the part of a rich person.
You are right, but not all poor people have that kind of behavior. We cannot draw conclusions that all people are the same, sometimes this does not correspond to what we see. Personal branding is sometimes necessary to attract attention and for other purposes that result in financial gain, but not for lifestyle (especially for those who are poor). So some may exist as you are talking about, but they are a minority.