I think in the US there is a tendency to view the working class differently. There is a national attitude that makes, certainly service workers, often very proud of what they do. That is something the UK could learn from the US actually.
Go in a some stores in the UK and you will likely be met with a sullen person working a minimum wage job who would rather be some place else (to see that amplified by ten, go to Russia). And it shows on their face.
In the US, amongst the native English speakers at least, there is way more enthusiasm. More of a pride in what they do. Because American society seems to encourage appreciation of workers more. Indeed, songs are written that support that.
I suppose this why some Americans seem very defensive on this subject, and prone perhaps to infer superciliousness on the part of the asker when none is intended.