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I've already thought about confirmation bias, even though I didn't call it that in my head lol that is a valid rebuttal. 
However, I will use the very risky example of racial stereotypes. We all have really clear notions in our heads that we have to suppress for morality's sake. And even though there are obviously people who perfectly fit that stereotype, there are always just as many people who barely adhere to the said stereotype, if at all. Same thing with any typology, not just race or astrology. 
And yet, because of the power of numbers alone, these stereotypes will always be valid until they are deemed obsolete bc they simply aren't at all true anymore. But that is obviously my opinion and I don't condone prejudice and prematurely judging people. A lot of it COULD be confirmation bias. However..
Everyone often forgets that two things can be true at the same time and I don't think that either of our theories are mutually exclusive.
Ouuuuu thank you for this! I’ve been looking for a resource about this but didn’t know what to search other than confirmation bias