Basically, everything that has already been mentioned. The only thing I disagree with is 'selfishness'/'selfcenteredness'. I believe that it is acceptable to a degree, and even redeemable in a fair amount of scenarios.
I respect people who can respect themselves and others for good and bad qualities.
Especially the case with those who accept the 'bad'. My old group of friends took to nicknaming one another with previous unideal situations. The parts of the group that had come to terms with their situations would allow the nicknames and realize they weren't meant to harm. It was, in an indirect way, a test of each of our personal growth, coping skills, ability to accept, and ability to be honest with one another. Very straight forward and not meant for the faint of heart
I also very much so respect people who can balance both a giving nature and a need to self-preserve. Balance is the greatest thing I respect, as well as personal happiness. If you can find balance and your own happiness, you can exude that much more outwardly. It's why I see a certain degree of selfishness and selfcenteredness as redeemable, although it shouldn't be too excessive. Again, balance.
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As per lacking respect..
I agree heavily with not respecting very negative people. Pessimism can be a driving factor, but when one isn't taking the time to implement any optimism.. or isn't allowing the positive to actually feel positive.. then there is issue.
I also can't respect people who don't take enough time to introspect, but claim to have everything figured out already. I'm aware there are different value systems, but being able to read into people gives the upper hand in seeing when they are genuinely aware of themselves vs. when they are evading themselves via other means.