Not everybody has heard a clear explanation of how you learn body language. It's not a trivial thing, and most exhortations to learn body language come across as "Because you fail to operate your meat-puppet according to a long list of rules which I will not explain, many of which you don't know that you don't know, you are socially and morally deficient."

The strange thing is that when a nerd is disrespected via reference to an engineering or physics principle that they are not in the loop about they are probably going to head to google and learn their missing knowledge. But not all of those same nerds will head to google to learn the social knowledge. It'll take a lot of study and practice to master it but there are more than enough resources available to get started.

For example.