Everything is already said in RFC 1855 (Netiquette Guidelines) When was it suddenly superseded?
Diversity? Respect? Inclusion? Sexual harassment?
Remember that the recipient is a human being whose culture,
language, and humor have different points of reference from your
own. Remember that date formats, measurements, and idioms may
not travel well. Be especially careful with sarcasm.There are Newsgroups and Mailing Lists which discuss topics
of wide varieties of interests. These represent a diversity of
lifestyles, religions, and cultures. Posting articles or sending
messages to a group whose point of view is offensive to you
simply to tell them they are offensive is not acceptable.
Sexually and racially harassing messages may also have legal
implications. There is software available to filter items
you might find objectionable.Since the Internet spans the globe, remember that Information
Services might reflect culture and life-style markedly different
from your own community. Materials you find offensive may
originate in a geography which finds them acceptable. Keep an open
mind.Microaggressions? Trigger warnings?
Wait overnight to send emotional responses to messages. If you
have really strong feelings about a subject, indicate it via
FLAME ON/OFF enclosures. For example:
FLAME ON: This type of argument is not worth the bandwidth
it takes to send it. It's illogical and poorly
reasoned. The rest of the world agrees with me.
FLAME OFFhttps://www.ietf.org/rfc/rfc1855.txt
October 1995
But, of course, people shoving their CoC down everyone's throat weren't even born.