I have never done much physical labor, although I recently had a "post office" job that required me to lift packages a lot. Part time, I also drove a delivery van. I worked for a university, not the USPS, and only delivered mail around the campus. Is that blue-collar enough?

I definitely came from blue-collar stock. My father was first a farmer and later a janitor in a large office building.

The only handkerchief I carry is a bandana. For me, that's a fashion statement. I haven't worn a tie in years, except for weddings and funerals. Many years ago, I had jobs that required me to wear a tie at work, but many offices have become a lot more informal since then.

I think there are definite differences in point of view between blue-collar and white-collar people, and one of them is the amount of tolerance for corporate bullshit.

You can work for a corporation and either resist the bullshitters, or suck up to them. I didn't suck up, and I think that, more than anything else, makes me blue-collar.