It sounds like maybe you see suits as a strong symbol of socioeconomic status, authority, power, and likely oppression. I don’t, and I’ve worked both blue collar and white collar jobs (including construction, since you specifically mentioned our vests). Also my current job is blue collar, if that matters to you.

In my country, suits are usually worn by working class people either at semi-formal occasions like weddings or in some professional settings (white collar office workers, public-facing service or sales personnel, etc). The wealthy are more likely to wear shorts and flip flops.

And I’m not sure why “pressed” and “blue” are so significant. Black and blue are just common colors. Pressed is not really a thing for most suits, so I assume you just mean businessy-looking. Suits can be expensive but most aren’t. Looking “nice” mostly comes down to whether it fits. A $50 wool suit off the rack looks great if it fits, and honestly few can tell the difference between a $100 and $1000 suit including me.

TL;DR: It’s OK to dislike a style of clothing. I think “suits” is kind of a broad category — if you said “Patagonia vests” it might seem more natural to me due to the tech/finance association — but still it’s fine to dislike suits. I only object to being afraid of or pre-judging people by their clothes alone, and moreover encouraging others to do so. In conclusion, and to answer your last question, suits are definitely not SS uniforms.

Edit: OK upon re-reading your reply, I realize there’s a pretty big age-gap here. Know that I’m not criticizing your preferences and it’s fine to have feelings about clothes. My advice is just to give people you don’t know the benefit of the doubt and do your best to treat others with respect regardless of their appearance, because many will surprise you as friends, allies, even comrades. Best of luck.