Take your pick: https://duckduckgo.com/?q=rules+of+etiquette&t=h_&ia=web
MEAA Journalist Code of Ethics
https://www.meaa.org/meaa-media/code-of-ethics/
Includes “Respect for the Rights of Others” (generally meant for minorities)
The WIIFM of etiquette
https://www.thespruce.com/how-you-benefit-from-proper-etiquette-1216688
Also see:
Rules Committee Approved “Decorum” Guidelines for House
https://democrats-rules.house.gov/press-release/rules-committee-approved-“decorum”-guidelines-house
“Jefferson’s Manual,” page 2
https://www.senate.gov/artandhistory/history/resources/pdf/SDoc103-8.pdf