I take issue with some of the above nekudos.
Poskim have dealt with a lot of these issues. If you look at many teshuvos, you’d understand that these were dealt with already.
Examples- shaking hands in the context of business meetings is mutar, because it’s not k’derech chiba. Chazon Ish disagrees, I believe, but most other poskim allow shaking hands in a business setting.
Many of the halachos that pertain to our interactions with non-Jews operate according to a legal mechanism of utility/reciprocity. Darkei shalom is a very profound thing.