Disagree. If you're using a service, understand how it works.
Not everything needs to be designed for idiots and lazy people, it's ok for some tools and services, especially those aimed at technical people and engineers to require reading to use properly and to be surprising or unintuitive at first glance.
There's got to be a word for these kinds of ridiculous arguments which use personal responsibility as a cudgel against a systematic fix.
I agree generally that interfaces have been dumbing down too far, but "private is actually not private and it's on you for not knowing that, idiot B)" is a weird place to be planting that flag.
There should probably also be a word for the belief that when a system doesn't work how you want it to, that is so obviously a systematic problem that needs fixing rather than, for example, evidence of differing goals or priorities that it is reasonable to describe anyone who thinks otherwise as ridiculous.
Not everything needs to be designed for idiots and lazy people, it's ok for some tools and services, especially those aimed at technical people and engineers to require reading to use properly and to be surprising or unintuitive at first glance.