I was a quality engineer in a machine shop and needed some product data. I created a simple spreadsheet on paper with simple instructions. Went to a machinist, great guy, salt of the earth type and asked him to help me. Handed him the sheets with brief explanation, and he agreed to help.
Went back next day, no data. When I asked he just sheepishly shrugged shoulders. So explained again , he said sure, went back next day same thing. Went to my manager to see if I was doing something wrong, he pulled me aside and said “he’s illiterate, and was too embarrassed to tell me” ......btw, he was running a half-million dollar piece of equipment.

@Canndue Proof that Illiterate doesn't mean stupid. Except he should already have had a plan for this situation. Most do.

@Hathacat I went back to him and suggest we gather the data together, he was ecstatic and worked harder than anyone to feed me the data.

@Canndue Perfect!

I was watching a woman in an assembly area assembling these tiny components. I was genuinely impressed at her skill. I commented “you have amazing manual dexterity!”. She got any , started cussing and declared “ she ain’t got manual dexterity!” ......alas

@Canndue Been in a similar situation, "Sorry did I say manual dexterity? I meant automatic dexterity" you can find stupid in both gender extremes and at all points between.

@Willow_Wisp absolutely, in my experience, when dealing with educated people, they tend to forget about their education and look down upon the uneducated. They forget that the uneducated are people too....