akuperma – and not everyone is formally dressed all of the time, unless you are the overseer or the camp commandant. Those who work wear work clothes, and work clothes means (in many situations) jeans.
It is the aversion to manual labor, the superiority, and the social bubble that he (and others in his society) live in that makes someone say something so arrogant, stupid, conceited and Racial. And that is why Denim Jeans are “chukas hagoy”, because they are associated with manual labor, which Juden, Southerners and Germans have Untermenchen do for them, but would never do themselves.
Chazal in many places disagree, but we are very far from Chazal.
DY – No Shaychus. As ZD pointed out, even a Melech wears jeans when they are appropriate wear.