It is difficult to explain why clothes (or vehicles) with slogans printed on them are bad for you. If it helps, consider that the vast majority of people you see outside are not wearing clothes with witticisms, they have all decided that it is not beneficial. The exceptions are mainly religious, political, and other extremists.
It’s interesting that you mention religion in the same paragraph in which you advocate forming beliefs based on the behaviour of the masses.
The beliefs he advocate forming are about what stuff communicates, and the behaviour of the audience sounds like a perfectly good way to base such beliefs on. (You found out what “cat” or “shit” meant (denotatively and connotatively) in English by noticing what circumstances English speakers used “cat” and “shit” in, didn’t you?)
It’s interesting that you mention religion in the same paragraph in which you advocate forming beliefs based on the behaviour of the masses.
Is there a better method for forming beliefs about fashion than observing the people whose sense of style you want to understand?
(Or more generally, what a message means by observing which people send it when; e.g., the way people learn their native language.)
The beliefs he advocate forming are about what stuff communicates, and the behaviour of the audience sounds like a perfectly good way to base such beliefs on. (You found out what “cat” or “shit” meant (denotatively and connotatively) in English by noticing what circumstances English speakers used “cat” and “shit” in, didn’t you?)