I've asked MNHQ...

[ChinaCupsandSaucers]

.....if we can have a little 'note' at the top of the Stepparenting board, with a list of acronyms that cause offence - to ensure that posters get support and threads aren't sidetracked by inadvertent use of common phrases that are less welcome here on MN;

www.mumsnet.com/Talk/site_stuff/1811572-Board-notes

Just to be clear though - I don't actually want to be my SD's mum. I'm just proud of her and how she affects my life.

Maybe a polite statement that you didn't like it would suffice instead of such strong terms such as 'vile' etc.. the thread will only go downhill from there and completely detract from the help and support the poster needed

Unfortunately, it's clear that there are some posters who seek to do just that and look for opportunities (such as inadvertant use of a term considered offensive) to derail threads - particularly here on the Stepparenting board, for all the reasons explained by Wednesday Martin in her book!
There are other posters (who have explained themselves previously on this thread) who are so offended by the term that they are unable to exercise restraint and cannot help but respond in a hostile and aggressive way to use of the term - they are unable to make a polite statement, or accept an apology from the OP.

Well yes - I guess if someone is having a bad day the SP threads seem to be an easy target for someone wishing to release their venom even if it is unrelated to the topic.