It may sound a little condescending, or like I’m bragging about something as elementary as putting on my pants or brushing my teeth, but I wouldn’t say that this thread is entirely unjustified either considering how so many adults are (almost) clueless about the subject.
It took me only 0.5–1 hour(s) to master this, and any frustration that I had was minor.
(Source.)
ETA: The first hyperlink in my post also showed examples of adults making irrational decisions simply because they, or somebody else, was in Africa. Anywhere in Africa, when the Ebola virus was confirmed in only three African countries.