The word "pretentious" among a few other examples, has been disgustingly MISUSED in (social) media the last 10 or so years especially.
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"Pretentious" is derived from the word "Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
"Pretend"
Which more or less means it refers to something insincere or fake.
However 99.99999999999999999999999999999% of the times it is used or has been used over at least the last 5, or maybe more like 10+ years, the word "pretentious" is being used with a meaning of, or acting, thinking like something or someone is better or superior than.
"They are so pretentious"
which translates or really means
"Look at how how much better they think they are"
That shares no connection really with pretending, being fake, lying, etc.
Even the idea of being ego-headed or narcissistic is a better wording or really what those who keep misusing the word "pretentious" really mean.
But I'm about 99.99999999999999999999999999% sure the ignorant masses and media will continue to misuse the word "pretentious" until someone, or more than one person of actual influence (obviously not me) finally realizes this and calls people out.
It's like the spelling of the word "Nite" with "Nick at Nite." There is no word spelled "Nite" yet it was used for decades before I suppose that incorrect spelling use died out.