1) slovak people
They do not know how do headphones work. I am serious. I have seen only one of them to figure out, that you can play music without tourchering everyone in your surrounding.

2) russians:
Russian people do know how to use headphones, but they have no idea how does trash bin work. Not only are they completelly unable to EVER take the trash out, I have even seen them several times take the trash bag, make a knot on it and leave it next to a bin. (3 of them before I had to report them for physical safety.

And, just so I don't hate only on people from other countries:
3) Czech:
Czech people are total masters of giving you useless advice. And I don't mean a normal type of useless, but monumental levels of useless, that even people in come would be able to figure out were useless.

Only from czech people can I get advice like: You'r roommate is makyng too much noise, why don't YOU put on headphones? (real advice I got)

Oh, You're suffering from insomnia since childhood, have you tried to stop drinking coffee? (Real advice I got FROM A DOCTORS!!! Yes, more then one doctor was that stupid)

Oh, you don't have friends, have you tried going outside? (🤔 )

You get the idea...