Unacceptable behavior that will result in a red tag:
Attempted or successful fraud or theft.
Business activity that resulted in the loss of funds by others.
Account sales
Merit sales / swapping
Harassing a DT
Offering escrow without a track record
Asking for a no collateral loan
Shilling / advertising MLM or ponzi
Escrowing for themselves
Late loan repayments / loan defaults.
Here's my input.
Any ponzi-related behavior.
Any behavior that involves an involuntary monetary transfer.
Buying reputation ≡ Buying trust ≡ Buying merit ≡ Buying accounts
Self-escrow.
Loan defaults (only if unpaid for an unreasonable amount of time)
Shilling scams.
ANN bumping, which is negative to the forum.
Using an alt account to abuse bounties/giveaways.
Selling gambling scripts or any "strategy" in a statistically -ev game.
Plagiarism.
Fake translations.
Ban evasion.
Hacked account.
What I consider not taggable:
Criticizing others.
Posting an unpopular opinion.
Leaving an unsubstantiated negative rating, if the user is not shady outside of this.
Promoting altcoins.
Using an alt account.
Anything without solid evidence or very strong circumstantial evidence*
*case-by-case