For Writers of Original Fiction

In my travels through some of the writing communities around LJ over the last few years I ran across a person who often put work up for critique and then behaved badly when people critiqued the work.

The writer was really looking for adoration rather than help improving the work. This writer defended every point, a lot of which were valid points and didn't want to see or hear anything that countered the work as it stood. In fact, the defense was so adamant, the author would inevitably fly into high orbit and hit meltdown. Every single time. This would, of course, make the others in the community jump on meltdown author in a feeding frenzy. Flame wars ensued.

About a year later I saw that the author had posted one of those pieces of work in another community, completely unchanged.

So, I bring you critique Etiquette.

( Critique Etiquette )

Does anyone have any more critique etiquette to add?

What do you need from a critique?
What makes a good critique?