So it sounds like there's a desire to get more concrete. Some people have brought up (mostly negative) examples from other wikis. I guess we can start collecting in this thread some examples of behaviors we would like to reject on Wikidata.
Please list behaviors you think should be unacceptable on Wikidata. Also, please comment on others' suggestions; if you just agree it should be considered unacceptable on Wikidata, please do express it by posting "+1" in a comment. This would really help gauge community opinion on the various behaviors mentioned.
Please describe the behaviors briefly and generally. The particular anecdote or experience that leads you to suggest this should be unacceptable is not necessary to make the suggestion; if it gets questioned, or people ask for an example, you could share at some greater length. But let's keep it brief and clear to help everyone participate.