Another aspect not mentioned so far (at least I did not see it) is that there are readers who either read too fast and jump to early conclusions or simply pick out the words of a post and latch onto them without reading the whole thing. Then they attack the parts offensive to them without getting the grasp of the whole. Off go the fireworks unnecessarily. They still have some sort of personality flaw or it still wouldn't happen.
Being a proofreader most of my life, I've learned to read anything I'm going to respond to for 3 reads. When one does that, it's amazing how many things one misses the first two reads. Doing the same thing when writing letters keeps from insulting people unintentionally.
Be kind, use the 3 times rule!
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Courtesy is Contagious.
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In theory, theory and reality are the same.
In reality, they're different!