To be "flattered" has a slightly different meaning from pure "flattery." You're correct in the definition of what flattery is, but to be "flattered" and to express that, is more often than not a polite response to hearing someone say something positive about you. It's a gracious recognition of their kind words, even if those words may be insincere/excessive.
More often that's not good, but that's probably because it's my polite way of saying I'm not interested just in case the compliment meant more than that to the guy
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It just means they're happy you would say nice things about them but they don't believe your complements are true.
Ya, it tends to be a polite lead in to "BUT... I am not interested."
if I say I'm flattered, then I think whatever it is that's flattering is sweet. but I'm not interested.
It depends on truth value of the statements.
No, it's not not not a good thing lol
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