People can, and will be dicks, who get embarrassed about not understanding shit and try to find blame elsewhere for their embarrassment.
Still, there is an important skill when teaching someone something, of understanding approximately how much they know, and telling them approximately the parts they don't, leaving them to ask you questions to fill the gaps afterwards. Makes teaching really fast when done right.
Had a whole argument once about capitalism v/s socialism only because I stated that, while neither is desireable, if I HAD to choose, I would rather live in the States than in Russia. Somehow that must have meant that I love the US and it is doing nothing wrong in my view but they are wrong because capitalism etc etc and I was just standing there like "...I literally did NOT say anything to do with that." And then they had the gall to claim that I am the one blowing up arguments. Yeah right.
I had a lot of that interaction with my mother before I figured out her algorithm. She'd ask about her cooking, "do you prefer food-A or food-B?" and if I gave a straight answer, I wouldn't see the other option for years. Then when someone brought it up later, she'd go "I thought you didn't like it".
Later on I learned to explain my preference as a ratio between A and B. I know she meant well, but bless her heart, she's neurotypical.