Comment by taeric

I don't know of any definitive classification for this. Probably easiest to begin with looking for passive versus active verbs? Run on sentences are usually bad, as well. Though, too many short sentences can effectively be a run on paragraph. :D

Inquisitive posts, of course, can largely look for question marks.

I think a lot of this boils down to "tone is hard to decipher in text." And is a large part of why so many of us default to assuming an aggressive tone from others. (Though, my personal pet idea there is that people are largely afraid to use questions more.)