They are asking a question regarding something they do not understand.
It is a true statement that roads are used to transport goods and services.
They then simply ask who in the video is carrying goods and products into stores/homes, and how workers move goods from ports to the stores.
They don't know how a system like this works when it comes to, for example, stocking a grocery store, because they have not worked or lived in a place with infrastructure like this.
It's just ad hominem and poor practice to call someone blind when they aren't familiar with something, particularly when they seem interested in how it works, and works contrary to convincing people of the cause.
If someone has worked with punch cards to program a computer all their life, and someone showed them software written the python programming language and they said:
"But the punch card is so that the computer can read in bytes to know what to do, in this text I don't see any bytes, there's nothing telling the computer if this is little endian or big endian, it all looks like a book. How does the text tell the computer what to do?"
Then my response would NOT be "Well the list comprehension here is yielding a range of numbers which are sent to the print function, and this class is acting as a signal handler. Aside from punch card brained, you're also blind".
My response would be a very happy opportunity to explain to them the benefits of a modern programming language versus punch cards, and how it works in comparison.
Unless this is a person known to be explicitly anti-bike and pro-car, it is bad to be this critical of them and works in no one's favor.