There's a fascinating phenomenon that isn't unique to tumblr, but which I have certainly seen here a lot, which I'm going to call the Default Assumption of Incompetence. It's when somebody has the baffling habit of always starting from the assumption that other people do not know anything about anything, or at least that having more knowledge than the assumer is extremely rare and statistically unlikely. To do this, they will frequently go out of their way to ignore context clues that indicate otherwise, or in some cases the assumer simply doesn't know enough about the subject at hand to be able to estimate whether or not this person knows what they are doing.
The assumer will see a social media post about someone's mushroom harvest, which clearly only contains exactly two distinct kinds of mushrooms, which the poster has identified and correctly named in the post itself, and the assumer will feel compelled to warn the forager to be careful out there! Some mushrooms are poisonous and they should be very careful to only pick ones they can identify! The assumer, who has ignored the fact that the poster did identify both of the mushroom species they had picked, and can most likely be trusted to do so in the future as well, has naturally assumed that the person showing off the results of their latest mushroom haul must have been obliviously picking them at random like an unsupervised toddler who is lucky to be alive.
If someone makes a post talking about how they just got a new job as a bus driver, the assumer might swoop in to warn them that driving a bus is extremely dangerous! It's so dangerous that it's literally illegal to do that unless you have a specific special training for doing that! Even a normal driver's license isn't good enough, you need a special license for it! And when the person who just got hired as a bus driver verifies that yes, they know that, they do have the license to drive a bus, and that they wouldn't have even hired someone who doesn't. The first question of the job interview was about making sure that they have a valid license for driving this type of vehicle.
"Well how was I supposed to know that?" is the assumer's standard answer to being corrected. Not embarrassed or apologetic, only defensive and insulted, as if the other person here is the one being unreasonably rude for implying that it was stupid of the assumer to assume that someone who just got a job driving a bus might not know how to drive a bus.
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