absolute quantities =/= proportional quantities
“x is one of the least common types of c” does not necessarily mean that there’s a small number of [x]. it means that, okay, there are a group of things classified as [c], and among the various sub-categories, the one we call [x] accounts for a comparatively small fraction of all things [c].
if something only occurs among 1-5% of the population, this does not mean it occurs to “almost no one,” a small number of people. 1-5% of the population is millions of people. it is simply a small portion of the number of people in existence.
fwiw, 1 in 20 or 1 in 100 is not vanishingly rare when it comes to human populations–in some cases, in fact, those would be considered an alarmingly high frequency. it all depends on the context. (if the incidence of tuberculosis in California was 1 in 20, it would be very alarming!)
(I see this come up in weird ways with, like, MBTI types or whatever. “Haha I constantly see people with INTP on their sidebar, how can it be one of the rarest types?” Because… most people who take the MBTI are not INTPs…?)
relatedly, a quantity need not be a majority to be disproportionately large. if 30% of what you’re doing focuses on a certain group, you could say that you’re not really focusing on them–70%, a clear majority, of what you’re doing focuses on other groups. however, if that group only accounts for 5% of what you’re studying, than focusing on them 30% of the time does look disproportionate.
note: “what I notice on Tumblr/Facebook/wherever” is not a representative sample of all populations