The problem is not necessarily unfriendliness (trustworthiness is harder to define so I'll not concentrate on this one first), it is more generally causing wron

The problem is not necessarily unfriendliness (trustworthiness is harder to define so I'll not concentrate on this one first), it is more generally causing wrongs to others. Of course on the friendly/unfriendly side, that could be by insulting them. But I'm not sure people asking for friendly colleagues actually have that restrictive definition in mind; some may quickly also require regular encouragements, small talks about your life, etc. Except if you are a social worker, that may not be part of your job description. If you have the feeling that helps and are inclined to do so, of course good for you. But this kind of matter, beyond professionalism that can be expected from anybody, should be considered as completely neutral. Causing wrongs to others could also be by breaking the systems of 30 coworkers (or even production) by not caring enough to test before deploying. Mild incompetency may not even really be a problem if you don't randomly chose to skip testing because you... I don't even know? trust your preferred deity that they have blessed the software this day? (of course particular situations need to be taken into account e.g. if the testing is expensive while the only breakage reasonable to expect is very easy to repair, then maybe go on, warn people, fuck the tests and deploy) That may be covered by trustworthiness. However at one point it is called doing your job, and skipping testing because you randomly feel it is OK could and should be a gross fault in some contexts -- and is maybe too rarely. That can be an honest mistake the first time for very junior people -- for others, it is simply not doing parts of your job with the expectation of a lower effort if things go well, and from an individual pov maybe mostly externalities if things go wrong. So yeah, it is better if you have colleagues who you can trust will care to actually do their job. I would not like a plane pilot who randomly say "fuck the checklist today, I've been flying for 10 years I know how to do it". I would not like an editor who suddenly sends manuscripts directly to the printer because the author usually don't make too many typos. Etc. And then, on top of that: being professional is a must (but people are humans so they can occasionally be pissed off too, hey maybe esp. if others are untrustworthy all the time...); being friendly is a plus.