There is a culture of not wearing the seat belt as a sign of trust.

When I was in Egypt, I'd get in the cab, wear my seat belt and the driver will look at me weird. "So you don't think I can drive?"

A few years later, the police started enforcing the law and most cabs didn't even have seat belts. You would get in and find a sort of belt that doesn't even tighten, hacked together only to circumvent the law.

Not to say that in the US it is any better. If you wear a seat belt while in the back seat, you are considered weird. It is a stigma that is not easy to get rid of especially for the younger generation.

Side note: I do get some dude yelling in English too. So yes, it is irrelevant.