The idea and mere depth of discussion through text is rather intrigueing, don't you think.
In person you have facial and body gestures as well as tone of your vioce.

Our language, is a rather meager attempt anyway to try and express all the emotions that sentiant beings are cabable of.
But through text I have seen many interesting topics evolve into an elaborate discussion.
In the mix we have:
A diversity in cultures.
gender gaps
Age gaps
Language barriers
Slang. Wich is often misunderstood
Acronyms. Causing confusion.
Misspelled words ( I wouldn't know about that )
Intellectual levels of education.
Speculation
Flat out lieing or stretching the truth.
preconcieved notions. People who have their own response before they really respect the text they are reading.
One word responses
Over elaborate dictionary.com responses.
Arrogance, stuborness and pride

Take all that into consideration when posts get a little heated.