That sounds like the Perl 5 Porters "Standards of Conduct", the official version of which is in perlpolicy:

The official forum for the development of perl is the perl5-porters mailing list, mentioned above, and its bugtracker at rt.perl.org. All participants in discussion there are expected to adhere to a standard of conduct.

• Always be civil.
• Heed the moderators.

Civility is simple: stick to the facts while avoiding demeaning remarks and sarcasm. It is not enough to be factual. You must also be civil. Responding in kind to incivility is not acceptable.

If the list moderators tell you that you are not being civil, carefully consider how your words have appeared before responding in any way. You may protest, but repeated protest in the face of a repeatedly reaffirmed decision is not acceptable.

Unacceptable behavior will result in a public and clearly identified warning. Repeated unacceptable behavior will result in removal from the mailing list and revocation of rights to update rt.perl.org. The first removal is for one month. Subsequent removals will double in length. After six months with no warning, a user's ban length is reset. Removals, like warnings, are public.

Although I think PerlMonks tends to be a little more lax than that (especially since "banning" is not really done here).