I think when someone is being prodded into taking that inner person out and examine what is in there some don't like what they see or they feel threatened by it. The thought of a person making a point that may not be flattering or opposite of the view that you have of yourself can be shattering. Some get highly enraged and lash out, others down play it and some really take it to heart. I have seen many different types of personalities here online.
Some, I will admit worry me in how they handle their anger towards others. The PURE rage and violence of their outbursts tell me they are struggling with some serious issues. Even I sometimes get angry at a post. But I step back, cool off, vent a few good choice words, and then come back to it and re-read it with attempted objectivity. If I cannot or have steam still coming out of my ears .. I bounce it off my husband who is a good sounding board at times.
Discussing it helps bring out what is bothering you about a certain post. Sometimes it hit too close to home and others it just someone's blind stabbing at the dark to make a rise come forth from the reader, and some are really thought provoking. As I say, " words placed together to illicit a prescribed response." Those who rabble rouse just to p/o people are people who have the need for attention. ANY attention even if it is the wrong type. So you let it ride.
Unless the person is actually harming you .. it is just a plea for "LOOK AT ME". When it is a plea for HELP me then that is when attention is needed.
Xandria