[colloydi]

I think it's because when we get to know other people IRL what they say is of secondary importance to how we perceive their intentions and motives. These determine how we feel about a person. They're subjective and hard to ascertain on the basis of written text alone.

So as a matter of caution we tend to impute bad motives to people we can't 'feel' clearly which means any textual claims made are subject to unnaturally high levels of scrutiny and demands for evidence/documentation.

Also the internet is forever whilst IRL conversation is throwaway.