the strident hisses of a nobody

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(1) By "people" I mean a variety of individuals from a variety of demographics. Some of these individuals may actually be bots, but I am working under the assumption that most individuals responding on Tumblr are human beings

(2) "Posts" can refer to text (or other media) posted on a variety of websites, but the fact that this commentary is being made on Tumblr implies that without additional qualifiers, "posts" refers primarily to Tumblr posts

(3) "Original Poster," used online to refer to the individual who started an individual post, thread, etc.

(4) The phrase "the post" now serves as a stand in for posts the OP(3) (in this case me) has seen where a person(1) has made the sort of commentary described here

(5) While not strictly grammatically correct, starting a sentence with "and" or "but" for emphasis is a common rhetorical flourish

(6) Note the qualifier

(7) See (1)

(8) "Understand" here means "interpret in the way the OP(3) intended"

(9) A hard number is not given here because there is no strict threshold, and there are many circumstances where fault is not cleanly divisible between OP(3) and the confused commenter(7)

(10) A general "you" is often used in informal writing as an equivalent of the pronoun "one" and does not address the reader as an individual, because it is not written with a specific individual in mind

(11) Metaphorically referring to explaining something in detail, not literal spelling of words