You are correct that I don't know you. That is an assumption I make with everyone I come into contact with. The inverse is also true.

Online, I am pretty sure that nobody knows or can know another person. I have also written about the hard lessons I have had because of that fact.

Neither facial expressions, nor voice inflections, nor any personal interactions can be had online. The prime example of such extenuating circumstances that highlight this is different understandings of defining the word "ignorant" which is a type of thing you have probably run into... Does it mean "stupid" or something else?